66731536 has 10 divisors (see below), whose sum is σ = 129292382. Its totient is φ = 33365760.

The previous prime is 66731519. The next prime is 66731549. The reversal of 66731536 is 63513766.

It can be written as a sum of positive squares in only one way, i.e., 58064400 + 8667136 = 7620^2 + 2944^2 .

It is a junction number, because it is equal to n+sod(n) for n = 66731495 and 66731504.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2085345 + ... + 2085376.

Almost surely, 2^66731536 is an apocalyptic number.

It is an amenable number.

66731536 is a deficient number, since it is larger than the sum of its proper divisors (62560846).

66731536 is a wasteful number, since it uses less digits than its factorization.

66731536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4170729 (or 4170723 counting only the distinct ones).

The product of its digits is 68040, while the sum is 37.

The square root of 66731536 is about 8168.9372625820. The cubic root of 66731536 is about 405.6116065340.

The spelling of 66731536 in words is "sixty-six million, seven hundred thirty-one thousand, five hundred thirty-six".