66156738 has 16 divisors (see below), whose sum is σ = 134289120. Its totient is φ = 21722976.

The previous prime is 66156731. The next prime is 66156749. The reversal of 66156738 is 83765166.

It is a self number, because there is not a number n which added to its sum of digits gives 66156738.

It is not an unprimeable number, because it can be changed into a prime (66156731) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81883 + ... + 82686.

It is an arithmetic number, because the mean of its divisors is an integer number (8393070).

Almost surely, 2^66156738 is an apocalyptic number.

66156738 is an abundant number, since it is smaller than the sum of its proper divisors (68132382).

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

66156738 is a wasteful number, since it uses less digits than its factorization.

66156738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164641.

The product of its digits is 181440, while the sum is 42.

The square root of 66156738 is about 8133.6792412782. The cubic root of 66156738 is about 404.4436561647.

The spelling of 66156738 in words is "sixty-six million, one hundred fifty-six thousand, seven hundred thirty-eight".