640504633351 has 8 divisors (see below), whose sum is σ = 729111993984. Its totient is φ = 556960550520.

The previous prime is 640504633337. The next prime is 640504633357. The reversal of 640504633351 is 153336405046.

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

It is not a de Polignac number, because 640504633351 - 2¹⁵ = 640504600583 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640504633357) 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, 1265819181 + ... + 1265819686.

It is an arithmetic number, because the mean of its divisors is an integer number (91138999248).

Almost surely, 2^640504633351 is an apocalyptic number.

640504633351 is a deficient number, since it is larger than the sum of its proper divisors (88607360633).

640504633351 is a wasteful number, since it uses less digits than its factorization.

640504633351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2531638901.

The product of its (nonzero) digits is 388800, while the sum is 40.

The spelling of 640504633351 in words is "six hundred forty billion, five hundred four million, six hundred thirty-three thousand, three hundred fifty-one".