655520168164 has 27 divisors (see below), whose sum is σ = 1218660900667. Its totient is φ = 308467124864.

The previous prime is 655520168111. The next prime is 655520168183. The reversal of 655520168164 is 461861025556.

The square root of 655520168164 is 809642.

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

It can be written as a sum of positive squares in 4 ways, for example, as 61079168164 + 594441000000 = 247142^2 + 771000^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 27515922 + ... + 27539734.

Almost surely, 2^655520168164 is an apocalyptic number.

655520168164 is the 809642-nd square number.

It is an amenable number.

655520168164 is a deficient number, since it is larger than the sum of its proper divisors (563140732503).

655520168164 is an frugal number, since it uses more digits than its factorization.

655520168164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47664 (or 23832 counting only the distinct ones).

The product of its (nonzero) digits is 1728000, while the sum is 49.

Multiplying 655520168164 by its sum of digits (49), we get a square (32120488240036 = 5667494²).

The spelling of 655520168164 in words is "six hundred fifty-five billion, five hundred twenty million, one hundred sixty-eight thousand, one hundred sixty-four".