66979936 has 12 divisors (see below), whose sum is σ = 131866812. Its totient is φ = 33489952.

The previous prime is 66979931. The next prime is 66979961. The reversal of 66979936 is 63997966.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66979931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1046530 + ... + 1046593.

It is an arithmetic number, because the mean of its divisors is an integer number (10988901).

Almost surely, 2^66979936 is an apocalyptic number.

It is an amenable number.

66979936 is a deficient number, since it is larger than the sum of its proper divisors (64886876).

66979936 is a wasteful number, since it uses less digits than its factorization.

66979936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2093133 (or 2093125 counting only the distinct ones).

The product of its digits is 3306744, while the sum is 55.

The square root of 66979936 is about 8184.1270762373. The cubic root of 66979936 is about 406.1142632600.

The spelling of 66979936 in words is "sixty-six million, nine hundred seventy-nine thousand, nine hundred thirty-six".