654264205956 has 81 divisors (see below), whose sum is σ = 1717700307141. Its totient is φ = 218044389888.

The previous prime is 654264205943. The next prime is 654264206027. The reversal of 654264205956 is 659502462456.

The square root of 654264205956 is 808866.

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

654264205956 is a `hidden beast` number, since 6 + 5 + 4 + 2 + 6 + 42 + 0 + 595 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 227614868100 + 426649337856 = 477090^2 + 653184^2 .

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

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 131033796 + ... + 131038788.

Almost surely, 2^654264205956 is an apocalyptic number.

654264205956 is the 808866-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 654264205956

654264205956 is an abundant number, since it is smaller than the sum of its proper divisors (1063436101185).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

654264205956 is an frugal number, since it uses more digits than its factorization.

654264205956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10014 (or 4998 counting only the distinct ones).

The product of its (nonzero) digits is 15552000, while the sum is 54.

The spelling of 654264205956 in words is "six hundred fifty-four billion, two hundred sixty-four million, two hundred five thousand, nine hundred fifty-six".