65656664 has 16 divisors (see below), whose sum is σ = 123789120. Its totient is φ = 32646240.

The previous prime is 65656649. The next prime is 65656687. The reversal of 65656664 is 46665656.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21224 + ... + 24119.

It is an arithmetic number, because the mean of its divisors is an integer number (7736820).

Almost surely, 2^65656664 is an apocalyptic number.

It is an amenable number.

65656664 is a deficient number, since it is larger than the sum of its proper divisors (58132456).

65656664 is a wasteful number, since it uses less digits than its factorization.

65656664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45530 (or 45526 counting only the distinct ones).

The product of its digits is 777600, while the sum is 44.

The square root of 65656664 is about 8102.8799818336. The cubic root of 65656664 is about 403.4220242239.

The spelling of 65656664 in words is "sixty-five million, six hundred fifty-six thousand, six hundred sixty-four".