66318525 has 144 divisors (see below), whose sum is σ = 151656960. Its totient is φ = 26956800.

The previous prime is 66318491. The next prime is 66318533. The reversal of 66318525 is 52581366.

It is not a de Polignac number, because 66318525 - 2⁷ = 66318397 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66318525.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 839436 + ... + 839514.

Almost surely, 2^66318525 is an apocalyptic number.

66318525 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

66318525 is an abundant number, since it is smaller than the sum of its proper divisors (85338435).

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

66318525 is a wasteful number, since it uses less digits than its factorization.

66318525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156 (or 148 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 66318525 is about 8143.6186673984. The cubic root of 66318525 is about 404.7730781833.

The spelling of 66318525 in words is "sixty-six million, three hundred eighteen thousand, five hundred twenty-five".