161556365454 has 48 divisors (see below), whose sum is σ = 363416503296. Its totient is φ = 47817942480.

The previous prime is 161556365417. The next prime is 161556365459. The reversal of 161556365454 is 454563655161.

It is a super-2 number, since 2×161556365454² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161556365397 and 161556365406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161556365459) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2556334 + ... + 2618769.

It is an arithmetic number, because the mean of its divisors is an integer number (7571177152).

Almost surely, 2^161556365454 is an apocalyptic number.

161556365454 is an abundant number, since it is smaller than the sum of its proper divisors (201860137842).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161556365454 is a wasteful number, since it uses less digits than its factorization.

161556365454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5175173 (or 5175162 counting only the distinct ones).

The product of its digits is 6480000, while the sum is 51.

The spelling of 161556365454 in words is "one hundred sixty-one billion, five hundred fifty-six million, three hundred sixty-five thousand, four hundred fifty-four".