66661516 has 12 divisors (see below), whose sum is σ = 118399288. Its totient is φ = 32833152.

The previous prime is 66661489. The next prime is 66661537. The reversal of 66661516 is 61516666.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124101 + ... + 124636.

Almost surely, 2^66661516 is an apocalyptic number.

It is an amenable number.

66661516 is a deficient number, since it is larger than the sum of its proper divisors (51737772).

66661516 is a wasteful number, since it uses less digits than its factorization.

66661516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248808 (or 248806 counting only the distinct ones).

The product of its digits is 38880, while the sum is 37.

The square root of 66661516 is about 8164.6503905556. The cubic root of 66661516 is about 405.4696903043.

The spelling of 66661516 in words is "sixty-six million, six hundred sixty-one thousand, five hundred sixteen".