66521036 has 18 divisors (see below), whose sum is σ = 118110300. Its totient is φ = 32782120.

The previous prime is 66521029. The next prime is 66521047. The reversal of 66521036 is 63012566.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18515 + ... + 21813.

Almost surely, 2^66521036 is an apocalyptic number.

It is an amenable number.

66521036 is a deficient number, since it is larger than the sum of its proper divisors (51589264).

66521036 is a wasteful number, since it uses less digits than its factorization.

66521036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3445 (or 3372 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 66521036 is about 8156.0429130798. The cubic root of 66521036 is about 405.1846660779.

The spelling of 66521036 in words is "sixty-six million, five hundred twenty-one thousand, thirty-six".