640172053474 has 8 divisors (see below), whose sum is σ = 961840055808. Its totient is φ = 319558701540.

The previous prime is 640172053403. The next prime is 640172053501. The reversal of 640172053474 is 474350271046.

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

It is a self number, because there is not a number n which added to its sum of digits gives 640172053474.

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 3 ways as a sum of consecutive naturals, for example, 263661082 + ... + 263663509.

It is an arithmetic number, because the mean of its divisors is an integer number (120230006976).

Almost surely, 2^640172053474 is an apocalyptic number.

640172053474 is a deficient number, since it is larger than the sum of its proper divisors (321668002334).

640172053474 is a wasteful number, since it uses less digits than its factorization.

640172053474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 527325200.

The product of its (nonzero) digits is 564480, while the sum is 43.

The spelling of 640172053474 in words is "six hundred forty billion, one hundred seventy-two million, fifty-three thousand, four hundred seventy-four".