617731420021564 has 6 divisors (see below), whose sum is σ = 1081029985037744. Its totient is φ = 308865710010780.

The previous prime is 617731420021511. The next prime is 617731420021567. The reversal of 617731420021564 is 465120024137716.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (617731420021567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77216427502692 + ... + 77216427502699.

Almost surely, 2^{617731420021564} is an apocalyptic number.

It is an amenable number.

617731420021564 is a deficient number, since it is larger than the sum of its proper divisors (463298565016180).

617731420021564 is a wasteful number, since it uses less digits than its factorization.

617731420021564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154432855005395 (or 154432855005393 counting only the distinct ones).

The product of its (nonzero) digits is 1693440, while the sum is 49.

The spelling of 617731420021564 in words is "six hundred seventeen trillion, seven hundred thirty-one billion, four hundred twenty million, twenty-one thousand, five hundred sixty-four".