161237954943 has 64 divisors (see below), whose sum is σ = 269898280960. Its totient is φ = 94448073600.

The previous prime is 161237954921. The next prime is 161237954959. The reversal of 161237954943 is 349459732161.

161237954943 is a `hidden beast` number, since 1 + 6 + 1 + 23 + 79 + 549 + 4 + 3 = 666.

It is not a de Polignac number, because 161237954943 - 2³² = 156942987647 is a prime.

It is a super-2 number, since 2×161237954943² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161237954943.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161237954963) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 542280 + ... + 785202.

It is an arithmetic number, because the mean of its divisors is an integer number (4217160640).

Almost surely, 2^161237954943 is an apocalyptic number.

161237954943 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

161237954943 is a deficient number, since it is larger than the sum of its proper divisors (108660326017).

161237954943 is a wasteful number, since it uses less digits than its factorization.

161237954943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243037 (or 243031 counting only the distinct ones).

The product of its digits is 4898880, while the sum is 54.

The spelling of 161237954943 in words is "one hundred sixty-one billion, two hundred thirty-seven million, nine hundred fifty-four thousand, nine hundred forty-three".