66788164 has 6 divisors (see below), whose sum is σ = 116879294. Its totient is φ = 33394080.

The previous prime is 66788093. The next prime is 66788171. The reversal of 66788164 is 46188766.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 65772100 + 1016064 = 8110^2 + 1008^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8348517 + ... + 8348524.

Almost surely, 2^66788164 is an apocalyptic number.

It is an amenable number.

66788164 is a deficient number, since it is larger than the sum of its proper divisors (50091130).

66788164 is a wasteful number, since it uses less digits than its factorization.

66788164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16697045 (or 16697043 counting only the distinct ones).

The product of its digits is 387072, while the sum is 46.

The square root of 66788164 is about 8172.4025843078. The cubic root of 66788164 is about 405.7263073256.

It can be divided in two parts, 667 and 88164, that added together give a triangular number (88831 = T₄₂₁).

The spelling of 66788164 in words is "sixty-six million, seven hundred eighty-eight thousand, one hundred sixty-four".