640265454051 has 16 divisors (see below), whose sum is σ = 890836005120. Its totient is φ = 408270598560.

The previous prime is 640265454007. The next prime is 640265454053. The reversal of 640265454051 is 150454562046.

It is not a de Polignac number, because 640265454051 - 2⁹ = 640265453539 is a prime.

It is a super-2 number, since 2×640265454051² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 640265453994 and 640265454012.

It is not an unprimeable number, because it can be changed into a prime (640265454053) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1973160 + ... + 2274618.

It is an arithmetic number, because the mean of its divisors is an integer number (55677250320).

Almost surely, 2^640265454051 is an apocalyptic number.

640265454051 is a deficient number, since it is larger than the sum of its proper divisors (250570551069).

640265454051 is a wasteful number, since it uses less digits than its factorization.

640265454051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332266.

The product of its (nonzero) digits is 576000, while the sum is 42.

The spelling of 640265454051 in words is "six hundred forty billion, two hundred sixty-five million, four hundred fifty-four thousand, fifty-one".