640172053364 has 24 divisors (see below), whose sum is σ = 1141639569000. Its totient is φ = 313991443584.

The previous prime is 640172053253. The next prime is 640172053379. The reversal of 640172053364 is 463350271046.

It can be written as a sum of positive squares in 4 ways, for example, as 139346917264 + 500825136100 = 373292^2 + 707690^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 956162 + ... + 1481414.

It is an arithmetic number, because the mean of its divisors is an integer number (47568315375).

Almost surely, 2^640172053364 is an apocalyptic number.

It is an amenable number.

640172053364 is a deficient number, since it is larger than the sum of its proper divisors (501467515636).

640172053364 is a wasteful number, since it uses less digits than its factorization.

640172053364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 531059 (or 531057 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 41.

The spelling of 640172053364 in words is "six hundred forty billion, one hundred seventy-two million, fifty-three thousand, three hundred sixty-four".