66779316 has 42 divisors (see below), whose sum is σ = 175223202. Its totient is φ = 22258800.

The previous prime is 66779299. The next prime is 66779333. The reversal of 66779316 is 61397766.

It is an interprime number because it is at equal distance from previous prime (66779299) and next prime (66779333).

It can be written as a sum of positive squares in only one way, i.e., 66487716 + 291600 = 8154^2 + 540^2 .

It is a congruent number.

It is an unprimeable number.

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 13 ways as a sum of consecutive naturals, for example, 8535 + ... + 14366.

It is an arithmetic number, because the mean of its divisors is an integer number (4171981).

Almost surely, 2^66779316 is an apocalyptic number.

It is an amenable number.

66779316 is an abundant number, since it is smaller than the sum of its proper divisors (108443886).

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

66779316 is a wasteful number, since it uses less digits than its factorization.

66779316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22923 (or 22906 counting only the distinct ones).

The product of its digits is 285768, while the sum is 45.

The square root of 66779316 is about 8171.8612323020. The cubic root of 66779316 is about 405.7083898549.

The spelling of 66779316 in words is "sixty-six million, seven hundred seventy-nine thousand, three hundred sixteen".