66155986 has 16 divisors (see below), whose sum is σ = 112492800. Its totient is φ = 28926288.

The previous prime is 66155941. The next prime is 66156017. The reversal of 66155986 is 68955166.

It is a super-2 number, since 2×66155986² = 8753228967264392, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66466 + ... + 67453.

It is an arithmetic number, because the mean of its divisors is an integer number (7030800).

Almost surely, 2^66155986 is an apocalyptic number.

66155986 is a deficient number, since it is larger than the sum of its proper divisors (46336814).

66155986 is a wasteful number, since it uses less digits than its factorization.

66155986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133953.

The product of its digits is 388800, while the sum is 46.

The square root of 66155986 is about 8133.6330136047. The cubic root of 66155986 is about 404.4421237293.

The spelling of 66155986 in words is "sixty-six million, one hundred fifty-five thousand, nine hundred eighty-six".