165921046491402 has 32 divisors (see below), whose sum is σ = 368726282328960. Its totient is φ = 55305088644960.

The previous prime is 165921046491391. The next prime is 165921046491413. The reversal of 165921046491402 is 204194640129561.

165921046491402 is a `hidden beast` number, since 1 + 6 + 5 + 9 + 2 + 104 + 6 + 491 + 40 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (165921046491391) and next prime (165921046491413).

It is a Harshad number since it is a multiple of its sum of digits (54).

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, 51958923 + ... + 55059710.

It is an arithmetic number, because the mean of its divisors is an integer number (11522696322780).

Almost surely, 2^{165921046491402} is an apocalyptic number.

165921046491402 is an abundant number, since it is smaller than the sum of its proper divisors (202805235837558).

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

165921046491402 is a wasteful number, since it uses less digits than its factorization.

165921046491402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107047355 (or 107047349 counting only the distinct ones).

The product of its (nonzero) digits is 3732480, while the sum is 54.

The spelling of 165921046491402 in words is "one hundred sixty-five trillion, nine hundred twenty-one billion, forty-six million, four hundred ninety-one thousand, four hundred two".