66365638032 has 40 divisors (see below), whose sum is σ = 171637960896. Its totient is φ = 22096925056.

The previous prime is 66365637973. The next prime is 66365638039. The reversal of 66365638032 is 23083656366.

It is a super-2 number, since 2×66365638032² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (66365638039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 736803 + ... + 821954.

Almost surely, 2^66365638032 is an apocalyptic number.

It is an amenable number.

66365638032 is an abundant number, since it is smaller than the sum of its proper divisors (105272322864).

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

66365638032 is a wasteful number, since it uses less digits than its factorization.

66365638032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1559655 (or 1559649 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 48.

The spelling of 66365638032 in words is "sixty-six billion, three hundred sixty-five million, six hundred thirty-eight thousand, thirty-two".