66369765 has 48 divisors (see below), whose sum is σ = 134775360. Its totient is φ = 27578880.

The previous prime is 66369763. The next prime is 66369767. The reversal of 66369765 is 56796366.

It is an interprime number because it is at equal distance from previous prime (66369763) and next prime (66369767).

It is not a de Polignac number, because 66369765 - 2¹ = 66369763 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 (66369763) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3981 + ... + 12189.

It is an arithmetic number, because the mean of its divisors is an integer number (2807820).

Almost surely, 2^66369765 is an apocalyptic number.

It is an amenable number.

66369765 is an abundant number, since it is smaller than the sum of its proper divisors (68405595).

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

66369765 is a wasteful number, since it uses less digits than its factorization.

66369765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8242 (or 8235 counting only the distinct ones).

The product of its digits is 1224720, while the sum is 48.

The square root of 66369765 is about 8146.7640815234. The cubic root of 66369765 is about 404.8772986013.

The spelling of 66369765 in words is "sixty-six million, three hundred sixty-nine thousand, seven hundred sixty-five".