66788157 has 16 divisors (see below), whose sum is σ = 90202112. Its totient is φ = 43953840.

The previous prime is 66788093. The next prime is 66788171. The reversal of 66788157 is 75188766.

It is not a de Polignac number, because 66788157 - 2⁶ = 66788093 is a prime.

It is a Duffinian number.

Its product of digits (564480) is a multiple of the sum of its prime divisors (1008).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66786157) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 116682 + ... + 117252.

It is an arithmetic number, because the mean of its divisors is an integer number (5637632).

Almost surely, 2^66788157 is an apocalyptic number.

It is an amenable number.

66788157 is a deficient number, since it is larger than the sum of its proper divisors (23413955).

66788157 is a wasteful number, since it uses less digits than its factorization.

66788157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1008.

The product of its digits is 564480, while the sum is 48.

The square root of 66788157 is about 8172.4021560371. The cubic root of 66788157 is about 405.7262931510.

The spelling of 66788157 in words is "sixty-six million, seven hundred eighty-eight thousand, one hundred fifty-seven".