66815948 has 12 divisors (see below), whose sum is σ = 116992680. Its totient is φ = 33389472.

The previous prime is 66815941. The next prime is 66815953. The reversal of 66815948 is 84951866.

It is a hoax number, since the sum of its digits (47) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (66815941) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 6440 + ... + 13232.

It is an arithmetic number, because the mean of its divisors is an integer number (9749390).

Almost surely, 2^66815948 is an apocalyptic number.

It is an amenable number.

66815948 is a deficient number, since it is larger than the sum of its proper divisors (50176732).

66815948 is a wasteful number, since it uses less digits than its factorization.

66815948 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9256 (or 9254 counting only the distinct ones).

The product of its digits is 414720, while the sum is 47.

The square root of 66815948 is about 8174.1022748679. The cubic root of 66815948 is about 405.7825604911.

The spelling of 66815948 in words is "sixty-six million, eight hundred fifteen thousand, nine hundred forty-eight".