66020157 has 16 divisors (see below), whose sum is σ = 111780480. Its totient is φ = 37725696.

The previous prime is 66020147. The next prime is 66020159. The reversal of 66020157 is 75102066.

66020157 is a `hidden beast` number, since 6 + 602 + 0 + 1 + 57 = 666.

It is not a de Polignac number, because 66020157 - 2⁷ = 66020029 is a prime.

It is a super-2 number, since 2×66020157² = 8717322260609298, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 66020157.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66020159) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 174468 + ... + 174845.

It is an arithmetic number, because the mean of its divisors is an integer number (6986280).

Almost surely, 2^66020157 is an apocalyptic number.

It is an amenable number.

66020157 is a deficient number, since it is larger than the sum of its proper divisors (45760323).

66020157 is a wasteful number, since it uses less digits than its factorization.

66020157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349329 (or 349323 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 66020157 is about 8125.2788875213. The cubic root of 66020157 is about 404.1651389227.

The spelling of 66020157 in words is "sixty-six million, twenty thousand, one hundred fifty-seven".