165664025722 has 8 divisors (see below), whose sum is σ = 267611118516. Its totient is φ = 76460319552.

The previous prime is 165664025707. The next prime is 165664025729. The reversal of 165664025722 is 227520466561.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 165161772801 + 502252921 = 406401^2 + 22411^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (165664025729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3185846623 + ... + 3185846674.

Almost surely, 2^165664025722 is an apocalyptic number.

165664025722 is a deficient number, since it is larger than the sum of its proper divisors (101947092794).

165664025722 is a wasteful number, since it uses less digits than its factorization.

165664025722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6371693312.

The product of its (nonzero) digits is 1209600, while the sum is 46.

The spelling of 165664025722 in words is "one hundred sixty-five billion, six hundred sixty-four million, twenty-five thousand, seven hundred twenty-two".