620672656657 has 4 divisors (see below), whose sum is σ = 620675292160. Its totient is φ = 620670021156.

The previous prime is 620672656633. The next prime is 620672656661. The reversal of 620672656657 is 756656276026.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-620672656657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (620672656757) 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, 925593 + ... + 1448470.

It is an arithmetic number, because the mean of its divisors is an integer number (155168823040).

Almost surely, 2^620672656657 is an apocalyptic number.

It is an amenable number.

620672656657 is a deficient number, since it is larger than the sum of its proper divisors (2635503).

620672656657 is a wasteful number, since it uses less digits than its factorization.

620672656657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2635502.

The product of its (nonzero) digits is 38102400, while the sum is 58.

The spelling of 620672656657 in words is "six hundred twenty billion, six hundred seventy-two million, six hundred fifty-six thousand, six hundred fifty-seven".