161461622121 has 16 divisors (see below), whose sum is σ = 224882093184. Its totient is φ = 102851109504.

The previous prime is 161461622059. The next prime is 161461622131. The reversal of 161461622121 is 121226164161.

It is not a de Polignac number, because 161461622121 - 2²⁷ = 161327404393 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (161461622131) 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, 1184026 + ... + 1313331.

It is an arithmetic number, because the mean of its divisors is an integer number (14055130824).

Almost surely, 2^161461622121 is an apocalyptic number.

It is an amenable number.

161461622121 is a deficient number, since it is larger than the sum of its proper divisors (63420471063).

161461622121 is a wasteful number, since it uses less digits than its factorization.

161461622121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2498320.

The product of its digits is 6912, while the sum is 33.

Adding to 161461622121 its reverse (121226164161), we get a palindrome (282687786282).

The spelling of 161461622121 in words is "one hundred sixty-one billion, four hundred sixty-one million, six hundred twenty-two thousand, one hundred twenty-one".