66415772 has 6 divisors (see below), whose sum is σ = 116227608. Its totient is φ = 33207884.

The previous prime is 66415759. The next prime is 66415781. The reversal of 66415772 is 27751466.

It is a super-2 number, since 2×66415772² = 8822109540711968, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8301968 + ... + 8301975.

It is an arithmetic number, because the mean of its divisors is an integer number (19371268).

Almost surely, 2^66415772 is an apocalyptic number.

It is an amenable number.

66415772 is a deficient number, since it is larger than the sum of its proper divisors (49811836).

66415772 is a wasteful number, since it uses less digits than its factorization.

66415772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16603947 (or 16603945 counting only the distinct ones).

The product of its digits is 70560, while the sum is 38.

The square root of 66415772 is about 8149.5872288110. The cubic root of 66415772 is about 404.9708295812.

The spelling of 66415772 in words is "sixty-six million, four hundred fifteen thousand, seven hundred seventy-two".