640531456775351 has 8 divisors (see below), whose sum is σ = 641263342893264. Its totient is φ = 639799574120640.

The previous prime is 640531456775341. The next prime is 640531456775407. The reversal of 640531456775351 is 153577654135046.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 640531456775351 - 2³⁸ = 640256578868407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640531456775341) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 639185771 + ... + 640187091.

It is an arithmetic number, because the mean of its divisors is an integer number (80157917861658).

Almost surely, 2^{640531456775351} is an apocalyptic number.

640531456775351 is a deficient number, since it is larger than the sum of its proper divisors (731886117913).

640531456775351 is a wasteful number, since it uses less digits than its factorization.

640531456775351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1731601.

The product of its (nonzero) digits is 158760000, while the sum is 62.

The spelling of 640531456775351 in words is "six hundred forty trillion, five hundred thirty-one billion, four hundred fifty-six million, seven hundred seventy-five thousand, three hundred fifty-one".