654555906 has 24 divisors (see below), whose sum is σ = 1419020460. Its totient is φ = 218059776.

The previous prime is 654555899. The next prime is 654555931. The reversal of 654555906 is 609555456.

654555906 is a `hidden beast` number, since 6 + 5 + 4 + 55 + 590 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 556724025 + 97831881 = 23595^2 + 9891^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24930 + ... + 43938.

Almost surely, 2^654555906 is an apocalyptic number.

654555906 is an abundant number, since it is smaller than the sum of its proper divisors (764464554).

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

654555906 is a wasteful number, since it uses less digits than its factorization.

654555906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20930 (or 20927 counting only the distinct ones).

The product of its (nonzero) digits is 810000, while the sum is 45.

The square root of 654555906 is about 25584.2902188042. The cubic root of 654555906 is about 868.2582433985.

The spelling of 654555906 in words is "six hundred fifty-four million, five hundred fifty-five thousand, nine hundred six".