66700905 has 16 divisors (see below), whose sum is σ = 107780544. Its totient is φ = 35220800.

The previous prime is 66700901. The next prime is 66700913. The reversal of 66700905 is 50900766.

It is not a de Polignac number, because 66700905 - 2² = 66700901 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66700901) 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, 20499 + ... + 23528.

It is an arithmetic number, because the mean of its divisors is an integer number (6736284).

Almost surely, 2^66700905 is an apocalyptic number.

It is an amenable number.

66700905 is a deficient number, since it is larger than the sum of its proper divisors (41079639).

66700905 is a wasteful number, since it uses less digits than its factorization.

66700905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44136.

The product of its (nonzero) digits is 11340, while the sum is 33.

The square root of 66700905 is about 8167.0622013059. The cubic root of 66700905 is about 405.5495359782.

The spelling of 66700905 in words is "sixty-six million, seven hundred thousand, nine hundred five".