165351321648 has 80 divisors (see below), whose sum is σ = 490985762400. Its totient is φ = 53216513280.

The previous prime is 165351321623. The next prime is 165351321673. The reversal of 165351321648 is 846123153561.

165351321648 is a `hidden beast` number, since 1 + 6 + 53 + 513 + 21 + 64 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (165351321623) and next prime (165351321673).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6586743 + ... + 6611798.

It is an arithmetic number, because the mean of its divisors is an integer number (6137322030).

Almost surely, 2^165351321648 is an apocalyptic number.

165351321648 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

165351321648 is an abundant number, since it is smaller than the sum of its proper divisors (325634440752).

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

165351321648 is a wasteful number, since it uses less digits than its factorization.

165351321648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13198587 (or 13198575 counting only the distinct ones).

The product of its digits is 518400, while the sum is 45.

The spelling of 165351321648 in words is "one hundred sixty-five billion, three hundred fifty-one million, three hundred twenty-one thousand, six hundred forty-eight".