66157660 has 24 divisors (see below), whose sum is σ = 144972576. Its totient is φ = 25312320.

The previous prime is 66157657. The next prime is 66157661. The reversal of 66157660 is 6675166.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66157661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71451 + ... + 72370.

It is an arithmetic number, because the mean of its divisors is an integer number (6040524).

Almost surely, 2^66157660 is an apocalyptic number.

It is an amenable number.

66157660 is an abundant number, since it is smaller than the sum of its proper divisors (78814916).

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

66157660 is a wasteful number, since it uses less digits than its factorization.

66157660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143853 (or 143851 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 37.

The square root of 66157660 is about 8133.7359189981. The cubic root of 66157660 is about 404.4455350125.

The spelling of 66157660 in words is "sixty-six million, one hundred fifty-seven thousand, six hundred sixty".