65664012 has 24 divisors (see below), whose sum is σ = 154389312. Its totient is φ = 21720400.

The previous prime is 65663993. The next prime is 65664037. The reversal of 65664012 is 21046656.

It is a super-2 number, since 2×65664012² = 8623524943872288, which contains 22 as substring.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19314 + ... + 22457.

It is an arithmetic number, because the mean of its divisors is an integer number (6432888).

Almost surely, 2^65664012 is an apocalyptic number.

It is an amenable number.

65664012 is an abundant number, since it is smaller than the sum of its proper divisors (88725300).

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

65664012 is a wasteful number, since it uses less digits than its factorization.

65664012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41909 (or 41907 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 65664012 is about 8103.3333881804. Note that the first 4 decimals coincide. The cubic root of 65664012 is about 403.4370733917.

The spelling of 65664012 in words is "sixty-five million, six hundred sixty-four thousand, twelve".