66159660 has 48 divisors (see below), whose sum is σ = 211712256. Its totient is φ = 15122112.

The previous prime is 66159659. The next prime is 66159677. The reversal of 66159660 is 6695166.

It is a super-2 number, since 2×66159660² = 8754201222631200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78342 + ... + 79181.

It is an arithmetic number, because the mean of its divisors is an integer number (4410672).

Almost surely, 2^66159660 is an apocalyptic number.

66159660 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66159660 is an abundant number, since it is smaller than the sum of its proper divisors (145552596).

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

66159660 is a wasteful number, since it uses less digits than its factorization.

66159660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157542 (or 157540 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 39.

The square root of 66159660 is about 8133.8588628031. The cubic root of 66159660 is about 404.4496105442.

The spelling of 66159660 in words is "sixty-six million, one hundred fifty-nine thousand, six hundred sixty".