6529940664921 has 24 divisors (see below), whose sum is σ = 9471878695136. Its totient is φ = 4334953541760.

The previous prime is 6529940664911. The next prime is 6529940664977. The reversal of 6529940664921 is 1294660499256.

6529940664921 is a `hidden beast` number, since 6 + 52 + 9 + 94 + 0 + 6 + 6 + 492 + 1 = 666.

It is not a de Polignac number, because 6529940664921 - 2⁶ = 6529940664857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6529940664911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37225806 + ... + 37400808.

Almost surely, 2^{6529940664921} is an apocalyptic number.

It is an amenable number.

6529940664921 is a deficient number, since it is larger than the sum of its proper divisors (2941938030215).

6529940664921 is a wasteful number, since it uses less digits than its factorization.

6529940664921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192453 (or 192450 counting only the distinct ones).

The product of its (nonzero) digits is 50388480, while the sum is 63.

The spelling of 6529940664921 in words is "six trillion, five hundred twenty-nine billion, nine hundred forty million, six hundred sixty-four thousand, nine hundred twenty-one".