66921124 has 6 divisors (see below), whose sum is σ = 117111974. Its totient is φ = 33460560.

The previous prime is 66921103. The next prime is 66921131. The reversal of 66921124 is 42112966.

It can be written as a sum of positive squares in only one way, i.e., 39463524 + 27457600 = 6282^2 + 5240^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8365137 + ... + 8365144.

Almost surely, 2^66921124 is an apocalyptic number.

It is an amenable number.

66921124 is a deficient number, since it is larger than the sum of its proper divisors (50190850).

66921124 is a wasteful number, since it uses less digits than its factorization.

66921124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16730285 (or 16730283 counting only the distinct ones).

The product of its digits is 5184, while the sum is 31.

The square root of 66921124 is about 8180.5332344536. The cubic root of 66921124 is about 405.9953650372.

The spelling of 66921124 in words is "sixty-six million, nine hundred twenty-one thousand, one hundred twenty-four".