164721783325 has 24 divisors (see below), whose sum is σ = 222848611776. Its totient is φ = 119784240000.

The previous prime is 164721783223. The next prime is 164721783329. The reversal of 164721783325 is 523387127461.

It is not a de Polignac number, because 164721783325 - 2²⁵ = 164688228893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164721783329) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2887024 + ... + 2943526.

It is an arithmetic number, because the mean of its divisors is an integer number (9285358824).

Almost surely, 2^164721783325 is an apocalyptic number.

It is an amenable number.

164721783325 is a deficient number, since it is larger than the sum of its proper divisors (58126828451).

164721783325 is a wasteful number, since it uses less digits than its factorization.

164721783325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67125 (or 67120 counting only the distinct ones).

The product of its digits is 1693440, while the sum is 49.

The spelling of 164721783325 in words is "one hundred sixty-four billion, seven hundred twenty-one million, seven hundred eighty-three thousand, three hundred twenty-five".