640105552355 has 16 divisors (see below), whose sum is σ = 792934272000. Its totient is φ = 495547258080.

The previous prime is 640105552343. The next prime is 640105552369. The reversal of 640105552355 is 553255501046.

It is not a de Polignac number, because 640105552355 - 2²² = 640101358051 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5381516 + ... + 5499174.

It is an arithmetic number, because the mean of its divisors is an integer number (49558392000).

Almost surely, 2^640105552355 is an apocalyptic number.

640105552355 is a deficient number, since it is larger than the sum of its proper divisors (152828719645).

640105552355 is a wasteful number, since it uses less digits than its factorization.

640105552355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152794.

The product of its (nonzero) digits is 450000, while the sum is 41.

The spelling of 640105552355 in words is "six hundred forty billion, one hundred five million, five hundred fifty-two thousand, three hundred fifty-five".