66156012 has 36 divisors (see below), whose sum is σ = 180092640. Its totient is φ = 20355552.

The previous prime is 66155941. The next prime is 66156017. The reversal of 66156012 is 21065166.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (66156017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70212 + ... + 71147.

Almost surely, 2^66156012 is an apocalyptic number.

It is an amenable number.

66156012 is an abundant number, since it is smaller than the sum of its proper divisors (113936628).

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

66156012 is a wasteful number, since it uses less digits than its factorization.

66156012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141382 (or 141377 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 66156012 is about 8133.6346119063. The cubic root of 66156012 is about 404.4421767127.

The spelling of 66156012 in words is "sixty-six million, one hundred fifty-six thousand, twelve".