165655142204099 has 4 divisors (see below), whose sum is σ = 166266415791840. Its totient is φ = 165043868616360.

The previous prime is 165655142204051. The next prime is 165655142204141. The reversal of 165655142204099 is 990402241556561.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 165655142204099 - 2⁸ = 165655142203843 is a prime.

It is a super-2 number, since 2×165655142204099² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165655142204399) 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, 305636793464 + ... + 305636794005.

It is an arithmetic number, because the mean of its divisors is an integer number (41566603947960).

Almost surely, 2^{165655142204099} is an apocalyptic number.

165655142204099 is a deficient number, since it is larger than the sum of its proper divisors (611273587741).

165655142204099 is an equidigital number, since it uses as much as digits as its factorization.

165655142204099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611273587740.

The product of its (nonzero) digits is 23328000, while the sum is 59.

The spelling of 165655142204099 in words is "one hundred sixty-five trillion, six hundred fifty-five billion, one hundred forty-two million, two hundred four thousand, ninety-nine".