66764565 has 48 divisors (see below), whose sum is σ = 133101696. Its totient is φ = 30326400.

The previous prime is 66764563. The next prime is 66764567. The reversal of 66764565 is 56546766.

It is an interprime number because it is at equal distance from previous prime (66764563) and next prime (66764567).

It is not a de Polignac number, because 66764565 - 2¹ = 66764563 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 66764565.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66764563) 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, 56430 + ... + 57600.

It is an arithmetic number, because the mean of its divisors is an integer number (2772952).

Almost surely, 2^66764565 is an apocalyptic number.

It is an amenable number.

66764565 is a deficient number, since it is larger than the sum of its proper divisors (66337131).

66764565 is a wasteful number, since it uses less digits than its factorization.

66764565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1370 (or 1367 counting only the distinct ones).

The product of its digits is 907200, while the sum is 45.

The square root of 66764565 is about 8170.9586340894. The cubic root of 66764565 is about 405.6785151096.

The spelling of 66764565 in words is "sixty-six million, seven hundred sixty-four thousand, five hundred sixty-five".