6720437846669 has 4 divisors (see below), whose sum is σ = 6720800094396. Its totient is φ = 6720075598944.

The previous prime is 6720437846659. The next prime is 6720437846719. The reversal of 6720437846669 is 9666487340276.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2195840894569 + 4524596952100 = 1481837^2 + 2127110^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6720437846669 is a prime.

It is a super-2 number, since 2×6720437846669² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6720437846599 and 6720437846608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6720437846659) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 181096034 + ... + 181133139.

It is an arithmetic number, because the mean of its divisors is an integer number (1680200023599).

Almost surely, 2^{6720437846669} is an apocalyptic number.

It is an amenable number.

6720437846669 is a deficient number, since it is larger than the sum of its proper divisors (362247727).

6720437846669 is a wasteful number, since it uses less digits than its factorization.

6720437846669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362247726.

The product of its (nonzero) digits is 438939648, while the sum is 68.

The spelling of 6720437846669 in words is "six trillion, seven hundred twenty billion, four hundred thirty-seven million, eight hundred forty-six thousand, six hundred sixty-nine".