161594773501 has 16 divisors (see below), whose sum is σ = 201103171200. Its totient is φ = 126694991808.

The previous prime is 161594773471. The next prime is 161594773531. The reversal of 161594773501 is 105377495161.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (161594773471) and next prime (161594773531).

It is not a de Polignac number, because 161594773501 - 2²³ = 161586384893 is a prime.

It is a super-2 number, since 2×161594773501² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161594773531) 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, 20944390 + ... + 20952103.

It is an arithmetic number, because the mean of its divisors is an integer number (12568948200).

Almost surely, 2^161594773501 is an apocalyptic number.

It is an amenable number.

161594773501 is a deficient number, since it is larger than the sum of its proper divisors (39508397699).

161594773501 is a wasteful number, since it uses less digits than its factorization.

161594773501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41896548.

The product of its (nonzero) digits is 793800, while the sum is 49.

The spelling of 161594773501 in words is "one hundred sixty-one billion, five hundred ninety-four million, seven hundred seventy-three thousand, five hundred one".