66915318 has 16 divisors (see below), whose sum is σ = 135059760. Its totient is φ = 22100256.

The previous prime is 66915313. The next prime is 66915361. The reversal of 66915318 is 81351966.

It is a super-2 number, since 2×66915318² = 8955319566082248, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66915313) 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, 50505 + ... + 51812.

It is an arithmetic number, because the mean of its divisors is an integer number (8441235).

Almost surely, 2^66915318 is an apocalyptic number.

66915318 is an abundant number, since it is smaller than the sum of its proper divisors (68144442).

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

66915318 is a wasteful number, since it uses less digits than its factorization.

66915318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102431.

The product of its digits is 38880, while the sum is 39.

The square root of 66915318 is about 8180.1783599137. The cubic root of 66915318 is about 405.9836234669.

The spelling of 66915318 in words is "sixty-six million, nine hundred fifteen thousand, three hundred eighteen".