66617372 has 24 divisors (see below), whose sum is σ = 119011200. Its totient is φ = 32618736.

The previous prime is 66617371. The next prime is 66617381. The reversal of 66617372 is 27371666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66617371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 103283 + ... + 103925.

It is an arithmetic number, because the mean of its divisors is an integer number (4958800).

Almost surely, 2^66617372 is an apocalyptic number.

It is an amenable number.

66617372 is a deficient number, since it is larger than the sum of its proper divisors (52393828).

66617372 is a wasteful number, since it uses less digits than its factorization.

66617372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1145 (or 1143 counting only the distinct ones).

The product of its digits is 63504, while the sum is 38.

The square root of 66617372 is about 8161.9465815454. The cubic root of 66617372 is about 405.3801683556.

The spelling of 66617372 in words is "sixty-six million, six hundred seventeen thousand, three hundred seventy-two".