66157344 has 96 divisors (see below), whose sum is σ = 210530880. Its totient is φ = 20044800.

The previous prime is 66157339. The next prime is 66157363. The reversal of 66157344 is 44375166.

It is a happy number.

66157344 is a `hidden beast` number, since 6 + 615 + 7 + 34 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 66157299 and 66157308.

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, 6024 + ... + 12984.

It is an arithmetic number, because the mean of its divisors is an integer number (2193030).

Almost surely, 2^66157344 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66157344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105265440).

66157344 is an abundant number, since it is smaller than the sum of its proper divisors (144373536).

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

66157344 is a wasteful number, since it uses less digits than its factorization.

66157344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6991 (or 6977 counting only the distinct ones).

The product of its digits is 60480, while the sum is 36.

The square root of 66157344 is about 8133.7164937069. The cubic root of 66157344 is about 404.4448910710. Note that the first 3 decimals are identical.

The spelling of 66157344 in words is "sixty-six million, one hundred fifty-seven thousand, three hundred forty-four".