6990751864009 has 3 divisors (see below), whose sum is σ = 6990754508013. Its totient is φ = 6990749220006.

The previous prime is 6990751864001. The next prime is 6990751864021. The reversal of 6990751864009 is 9004681570996.

The square root of 6990751864009 is 2644003.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 6990751864009 - 2³ = 6990751864001 is a prime.

It is a super-2 number, since 2×6990751864009² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6990751864001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1322002 + ... + 3966004.

It is an arithmetic number, because the mean of its divisors is an integer number (2330251502671).

Almost surely, 2^{6990751864009} is an apocalyptic number.

6990751864009 is the 2644003-rd square number.

6990751864009 is the 1322002-nd centered octagonal number.

It is an amenable number.

6990751864009 is a deficient number, since it is larger than the sum of its proper divisors (2644004).

6990751864009 is an frugal number, since it uses more digits than its factorization.

6990751864009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5288006 (or 2644003 counting only the distinct ones).

The product of its (nonzero) digits is 29393280, while the sum is 64.

Multiplying 6990751864009 by its sum of digits (64), we get a square (447408119296576 = 21152024²).

The spelling of 6990751864009 in words is "six trillion, nine hundred ninety billion, seven hundred fifty-one million, eight hundred sixty-four thousand, nine".