655444064025 has 81 divisors (see below), whose sum is σ = 1219674163071. Its totient is φ = 349395294960.

The previous prime is 655444063997. The next prime is 655444064027. The reversal of 655444064025 is 520460444556.

The square root of 655444064025 is 809595.

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

655444064025 is a `hidden beast` number, since 6 + 5 + 544 + 40 + 6 + 40 + 25 = 666.

It can be written as a sum of positive squares in only one way, i.e., 235959863049 + 419484200976 = 485757^2 + 647676^2 .

It is a tau number, because it is divible by the number of its divisors (81).

It is a de Polignac number, because none of the positive numbers 2^k-655444064025 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (655444064027) by changing a digit.

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 80 ways as a sum of consecutive naturals, for example, 327884976 + ... + 327886974.

Almost surely, 2^655444064025 is an apocalyptic number.

655444064025 is the 809595-th square number.

655444064025 is the 404798-th centered octagonal number.

It is an amenable number.

655444064025 is a deficient number, since it is larger than the sum of its proper divisors (564230099046).

655444064025 is an frugal number, since it uses more digits than its factorization.

655444064025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4032 (or 2007 counting only the distinct ones).

The product of its (nonzero) digits is 2304000, while the sum is 45.

The spelling of 655444064025 in words is "six hundred fifty-five billion, four hundred forty-four million, sixty-four thousand, twenty-five".