161037450121 has 4 divisors (see below), whose sum is σ = 161038484992. Its totient is φ = 161036415252.

The previous prime is 161037450103. The next prime is 161037450127. The reversal of 161037450121 is 121054730161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161037450121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161037450127) 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, 231261 + ... + 612826.

It is an arithmetic number, because the mean of its divisors is an integer number (40259621248).

Almost surely, 2^161037450121 is an apocalyptic number.

It is an amenable number.

161037450121 is a deficient number, since it is larger than the sum of its proper divisors (1034871).

161037450121 is an equidigital number, since it uses as much as digits as its factorization.

161037450121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1034870.

The product of its (nonzero) digits is 5040, while the sum is 31.

The spelling of 161037450121 in words is "one hundred sixty-one billion, thirty-seven million, four hundred fifty thousand, one hundred twenty-one".