640174551520 has 96 divisors (see below), whose sum is σ = 1830146125248. Its totient is φ = 206577328128.

The previous prime is 640174551479. The next prime is 640174551557. The reversal of 640174551520 is 25155471046.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

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, 16792267 + ... + 16830346.

It is an arithmetic number, because the mean of its divisors is an integer number (19064022138).

Almost surely, 2^640174551520 is an apocalyptic number.

It is an amenable number.

640174551520 is an abundant number, since it is smaller than the sum of its proper divisors (1189971573728).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

640174551520 is a wasteful number, since it uses less digits than its factorization.

640174551520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33622652 (or 33622644 counting only the distinct ones).

The product of its (nonzero) digits is 168000, while the sum is 40.

The spelling of 640174551520 in words is "six hundred forty billion, one hundred seventy-four million, five hundred fifty-one thousand, five hundred twenty".