66156988 has 12 divisors (see below), whose sum is σ = 115831800. Its totient is φ = 33062192.

The previous prime is 66156983. The next prime is 66156989. The reversal of 66156988 is 88965166.

It is a super-2 number, since 2×66156988² = 8753494122464288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66156983) 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 3 ways as a sum of consecutive naturals, for example, 13038 + ... + 17386.

It is an arithmetic number, because the mean of its divisors is an integer number (9652650).

Almost surely, 2^66156988 is an apocalyptic number.

It is an amenable number.

66156988 is a deficient number, since it is larger than the sum of its proper divisors (49674812).

66156988 is a wasteful number, since it uses less digits than its factorization.

66156988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8156 (or 8154 counting only the distinct ones).

The product of its digits is 622080, while the sum is 49.

The square root of 66156988 is about 8133.6946094625. The cubic root of 66156988 is about 404.4441656154. Note that the first 3 decimals are identical.

The spelling of 66156988 in words is "sixty-six million, one hundred fifty-six thousand, nine hundred eighty-eight".