640465355431 has 32 divisors (see below), whose sum is σ = 714017102400. Its totient is φ = 574384250880.

The previous prime is 640465355419. The next prime is 640465355447. The reversal of 640465355431 is 134553564046.

It is not a de Polignac number, because 640465355431 - 2¹³ = 640465347239 is a prime.

It is a super-2 number, since 2×640465355431² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640465356431) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 40919095 + ... + 40934743.

It is an arithmetic number, because the mean of its divisors is an integer number (22313034450).

Almost surely, 2^640465355431 is an apocalyptic number.

640465355431 is a deficient number, since it is larger than the sum of its proper divisors (73551746969).

640465355431 is a wasteful number, since it uses less digits than its factorization.

640465355431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16096 (or 16074 counting only the distinct ones).

The product of its (nonzero) digits is 2592000, while the sum is 46.

The spelling of 640465355431 in words is "six hundred forty billion, four hundred sixty-five million, three hundred fifty-five thousand, four hundred thirty-one".