66616956 has 36 divisors (see below), whose sum is σ = 192449712. Its totient is φ = 19033344.

The previous prime is 66616943. The next prime is 66617017. The reversal of 66616956 is 65961666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a zygodrome in base 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 131925 + ... + 132428.

Almost surely, 2^66616956 is an apocalyptic number.

It is an amenable number.

66616956 is an abundant number, since it is smaller than the sum of its proper divisors (125832756).

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

66616956 is a wasteful number, since it uses less digits than its factorization.

66616956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264370 (or 264365 counting only the distinct ones).

The product of its digits is 349920, while the sum is 45.

The square root of 66616956 is about 8161.9210973888. The cubic root of 66616956 is about 405.3793245391.

The spelling of 66616956 in words is "sixty-six million, six hundred sixteen thousand, nine hundred fifty-six".