6620240528857 has 4 divisors (see below), whose sum is σ = 6621376666576. Its totient is φ = 6619104391140.

The previous prime is 6620240528851. The next prime is 6620240528873. The reversal of 6620240528857 is 7588250420266.

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 not a de Polignac number, because 6620240528857 - 2²⁷ = 6620106311129 is a prime.

It is a super-2 number, since 2×6620240528857² (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 = 6620240528798 and 6620240528807.

It is not an unprimeable number, because it can be changed into a prime (6620240528851) 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, 568060119 + ... + 568071772.

It is an arithmetic number, because the mean of its divisors is an integer number (1655344166644).

Almost surely, 2^{6620240528857} is an apocalyptic number.

It is an amenable number.

6620240528857 is a deficient number, since it is larger than the sum of its proper divisors (1136137719).

6620240528857 is a wasteful number, since it uses less digits than its factorization.

6620240528857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1136137718.

The product of its (nonzero) digits is 12902400, while the sum is 55.

The spelling of 6620240528857 in words is "six trillion, six hundred twenty billion, two hundred forty million, five hundred twenty-eight thousand, eight hundred fifty-seven".