66911715 has 48 divisors (see below), whose sum is σ = 130358592. Its totient is φ = 31502592.

The previous prime is 66911699. The next prime is 66911737. The reversal of 66911715 is 51711966.

It is a happy number.

It is not a de Polignac number, because 66911715 - 2⁴ = 66911699 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66911715.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 10969 + ... + 15941.

It is an arithmetic number, because the mean of its divisors is an integer number (2715804).

Almost surely, 2^66911715 is an apocalyptic number.

66911715 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

66911715 is a deficient number, since it is larger than the sum of its proper divisors (63446877).

66911715 is a wasteful number, since it uses less digits than its factorization.

66911715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5020 (or 5017 counting only the distinct ones).

The product of its digits is 11340, while the sum is 36.

The square root of 66911715 is about 8179.9581294772. The cubic root of 66911715 is about 405.9763367185.

The spelling of 66911715 in words is "sixty-six million, nine hundred eleven thousand, seven hundred fifteen".