515894554564 has 9 divisors (see below), whose sum is σ = 902817984397. Its totient is φ = 257946559024.

The previous prime is 515894554561. The next prime is 515894554573. The reversal of 515894554564 is 465455498515.

The square root of 515894554564 is 718258.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 49569460164 + 466325094400 = 222642^2 + 682880^2 .

It is a super-2 number, since 2×515894554564² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (515894554561) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1256952 + ... + 1616080.

Almost surely, 2^515894554564 is an apocalyptic number.

515894554564 is the 718258-th square number.

It is an amenable number.

515894554564 is a deficient number, since it is larger than the sum of its proper divisors (386923429833).

515894554564 is an frugal number, since it uses more digits than its factorization.

515894554564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 718262 (or 359131 counting only the distinct ones).

The product of its digits is 86400000, while the sum is 61.

The spelling of 515894554564 in words is "five hundred fifteen billion, eight hundred ninety-four million, five hundred fifty-four thousand, five hundred sixty-four".