66999536 has 10 divisors (see below), whose sum is σ = 129811632. Its totient is φ = 33499760.

The previous prime is 66999523. The next prime is 66999551. The reversal of 66999536 is 63599966.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2093720 + ... + 2093751.

Almost surely, 2^66999536 is an apocalyptic number.

It is an amenable number.

66999536 is a deficient number, since it is larger than the sum of its proper divisors (62812096).

66999536 is a wasteful number, since it uses less digits than its factorization.

66999536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4187479 (or 4187473 counting only the distinct ones).

The product of its digits is 2361960, while the sum is 53.

The square root of 66999536 is about 8185.3244285123. The cubic root of 66999536 is about 406.1538724512.

The spelling of 66999536 in words is "sixty-six million, nine hundred ninety-nine thousand, five hundred thirty-six".