66100965 has 64 divisors (see below), whose sum is σ = 127844352. Its totient is φ = 28512000.

The previous prime is 66100961. The next prime is 66100973. The reversal of 66100965 is 56900166.

It is not a de Polignac number, because 66100965 - 2² = 66100961 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66100961) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 243780 + ... + 244050.

It is an arithmetic number, because the mean of its divisors is an integer number (1997568).

Almost surely, 2^66100965 is an apocalyptic number.

It is an amenable number.

66100965 is a deficient number, since it is larger than the sum of its proper divisors (61743387).

66100965 is a wasteful number, since it uses less digits than its factorization.

66100965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410.

The product of its (nonzero) digits is 9720, while the sum is 33.

The square root of 66100965 is about 8130.2499961563. The cubic root of 66100965 is about 404.3299696956.

The spelling of 66100965 in words is "sixty-six million, one hundred thousand, nine hundred sixty-five".