161541011256 has 16 divisors (see below), whose sum is σ = 403852528200. Its totient is φ = 53847003744.

The previous prime is 161541011251. The next prime is 161541011273. The reversal of 161541011256 is 652110145161.

It is a super-2 number, since 2×161541011256² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161541011251) 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, 3365437711 + ... + 3365437758.

Almost surely, 2^161541011256 is an apocalyptic number.

It is an amenable number.

161541011256 is an abundant number, since it is smaller than the sum of its proper divisors (242311516944).

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

161541011256 is a wasteful number, since it uses less digits than its factorization.

161541011256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6730875478 (or 6730875474 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 33.

The spelling of 161541011256 in words is "one hundred sixty-one billion, five hundred forty-one million, eleven thousand, two hundred fifty-six".