66652032161 has 48 divisors (see below), whose sum is σ = 81192956880. Its totient is φ = 54317260800.

The previous prime is 66652032151. The next prime is 66652032163. The reversal of 66652032161 is 16123025666.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 21211009600 + 45441022561 = 145640^2 + 213169^2 .

It is not a de Polignac number, because 66652032161 - 2²⁶ = 66584923297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66652032163) 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, 14766641 + ... + 14771153.

It is an arithmetic number, because the mean of its divisors is an integer number (1691519935).

Almost surely, 2^66652032161 is an apocalyptic number.

It is an amenable number.

66652032161 is a deficient number, since it is larger than the sum of its proper divisors (14540924719).

66652032161 is a wasteful number, since it uses less digits than its factorization.

66652032161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4818 (or 4807 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 38.

The spelling of 66652032161 in words is "sixty-six billion, six hundred fifty-two million, thirty-two thousand, one hundred sixty-one".