161497404218121 has 16 divisors (see below), whose sum is σ = 215364816840000. Its totient is φ = 107647465218048.

The previous prime is 161497404218113. The next prime is 161497404218147. The reversal of 161497404218121 is 121812404794161.

It is a happy number.

It is not a de Polignac number, because 161497404218121 - 2³ = 161497404218113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161497404218321) 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, 522309850 + ... + 522618956.

It is an arithmetic number, because the mean of its divisors is an integer number (13460301052500).

Almost surely, 2^{161497404218121} is an apocalyptic number.

It is an amenable number.

161497404218121 is a deficient number, since it is larger than the sum of its proper divisors (53867412621879).

161497404218121 is a wasteful number, since it uses less digits than its factorization.

161497404218121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336808.

The product of its (nonzero) digits is 774144, while the sum is 51.

The spelling of 161497404218121 in words is "one hundred sixty-one trillion, four hundred ninety-seven billion, four hundred four million, two hundred eighteen thousand, one hundred twenty-one".