1640640625955 has 32 divisors (see below), whose sum is σ = 2105039591424. Its totient is φ = 1223237203456.

The previous prime is 1640640625903. The next prime is 1640640626033. The reversal of 1640640625955 is 5595260460461.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1640640625955 - 2⁸ = 1640640625699 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1640640625897 and 1640640625906.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3513554 + ... + 3953016.

It is an arithmetic number, because the mean of its divisors is an integer number (65782487232).

Almost surely, 2^{1640640625955} is an apocalyptic number.

1640640625955 is a deficient number, since it is larger than the sum of its proper divisors (464398965469).

1640640625955 is a wasteful number, since it uses less digits than its factorization.

1640640625955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439915.

The product of its (nonzero) digits is 7776000, while the sum is 53.

The spelling of 1640640625955 in words is "one trillion, six hundred forty billion, six hundred forty million, six hundred twenty-five thousand, nine hundred fifty-five".