165215464352121 has 16 divisors (see below), whose sum is σ = 223429259970560. Its totient is φ = 108577074911760.

The previous prime is 165215464352093. The next prime is 165215464352171. The reversal of 165215464352121 is 121253464512561.

It is not a de Polignac number, because 165215464352121 - 2¹⁴ = 165215464335737 is a prime.

It is a super-2 number, since 2×165215464352121² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (165215464352171) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 552236875 + ... + 552535968.

It is an arithmetic number, because the mean of its divisors is an integer number (13964328748160).

Almost surely, 2^{165215464352121} is an apocalyptic number.

It is an amenable number.

165215464352121 is a deficient number, since it is larger than the sum of its proper divisors (58213795618439).

165215464352121 is a wasteful number, since it uses less digits than its factorization.

165215464352121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1104773556.

The product of its digits is 1728000, while the sum is 48.

The spelling of 165215464352121 in words is "one hundred sixty-five trillion, two hundred fifteen billion, four hundred sixty-four million, three hundred fifty-two thousand, one hundred twenty-one".