66115907 has 16 divisors (see below), whose sum is σ = 82246752. Its totient is φ = 52216320.

The previous prime is 66115883. The next prime is 66115909. The reversal of 66115907 is 70951166.

It is not a de Polignac number, because 66115907 - 2¹⁸ = 65853763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66115909) 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, 11168 + ... + 16029.

It is an arithmetic number, because the mean of its divisors is an integer number (5140422).

Almost surely, 2^66115907 is an apocalyptic number.

66115907 is a deficient number, since it is larger than the sum of its proper divisors (16130845).

66115907 is a wasteful number, since it uses less digits than its factorization.

66115907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27238.

The product of its (nonzero) digits is 11340, while the sum is 35.

The square root of 66115907 is about 8131.1688581655. The cubic root of 66115907 is about 404.3604334124.

The spelling of 66115907 in words is "sixty-six million, one hundred fifteen thousand, nine hundred seven".