655918408 has 8 divisors (see below), whose sum is σ = 1229847030. Its totient is φ = 327959200.

The previous prime is 655918387. The next prime is 655918423. The reversal of 655918408 is 804819556.

It can be written as a sum of positive squares in only one way, i.e., 629106724 + 26811684 = 25082^2 + 5178^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40994893 + ... + 40994908.

Almost surely, 2^655918408 is an apocalyptic number.

It is an amenable number.

655918408 is a deficient number, since it is larger than the sum of its proper divisors (573928622).

655918408 is a wasteful number, since it uses less digits than its factorization.

655918408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81989807 (or 81989803 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 46.

The square root of 655918408 is about 25610.9040840030. The cubic root of 655918408 is about 868.8602717847.

The spelling of 655918408 in words is "six hundred fifty-five million, nine hundred eighteen thousand, four hundred eight".