6720609951 has 18 divisors (see below), whose sum is σ = 10670281440. Its totient is φ = 4073096280.

The previous prime is 6720609923. The next prime is 6720609967. The reversal of 6720609951 is 1599060276.

It is a happy number.

It is not a de Polignac number, because 6720609951 - 2¹⁰ = 6720608927 is a prime.

It is a super-2 number, since 2×6720609951² = 90333196226960444802, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6720609897 and 6720609906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6720609991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 3084591 + ... + 3086768.

Almost surely, 2^6720609951 is an apocalyptic number.

6720609951 is a deficient number, since it is larger than the sum of its proper divisors (3949671489).

6720609951 is a wasteful number, since it uses less digits than its factorization.

6720609951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6171387 (or 6171373 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 45.

The square root of 6720609951 is about 81979.3263634192. The cubic root of 6720609951 is about 1887.1346848866.

The spelling of 6720609951 in words is "six billion, seven hundred twenty million, six hundred nine thousand, nine hundred fifty-one".