66151616 has 28 divisors (see below), whose sum is σ = 138181080. Its totient is φ = 31334400.

The previous prime is 66151609. The next prime is 66151621. The reversal of 66151616 is 61615166.

It is a super-2 number, since 2×66151616² = 8752072598822912, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (32).

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, 25985 + ... + 28416.

Almost surely, 2^66151616 is an apocalyptic number.

It is an amenable number.

66151616 is an abundant number, since it is smaller than the sum of its proper divisors (72029464).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66151616 is a wasteful number, since it uses less digits than its factorization.

66151616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54432 (or 54422 counting only the distinct ones).

The product of its digits is 6480, while the sum is 32.

The square root of 66151616 is about 8133.3643715255. The cubic root of 66151616 is about 404.4332182566.

The spelling of 66151616 in words is "sixty-six million, one hundred fifty-one thousand, six hundred sixteen".