17861081161 has 72 divisors (see below), whose sum is σ = 24059585088. Its totient is φ = 12975705600.

The previous prime is 17861081113. The next prime is 17861081171. The reversal of 17861081161 is 16118016871.

It is not a de Polignac number, because 17861081161 - 2¹³ = 17861072969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (17861081171) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 32066295 + ... + 32066851.

It is an arithmetic number, because the mean of its divisors is an integer number (334160904).

Almost surely, 2^17861081161 is an apocalyptic number.

17861081161 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

17861081161 is a deficient number, since it is larger than the sum of its proper divisors (6198503927).

17861081161 is a wasteful number, since it uses less digits than its factorization.

17861081161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 751 (or 723 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 40.

The spelling of 17861081161 in words is "seventeen billion, eight hundred sixty-one million, eighty-one thousand, one hundred sixty-one".