80581609161 has 15 divisors (see below), whose sum is σ = 120378812983. Its totient is φ = 53719369560.

The previous prime is 80581609159. The next prime is 80581609177. The reversal of 80581609161 is 16190618508.

The square root of 80581609161 is 283869.

It is a perfect power (a square), and thus also a powerful number.

80581609161 is a `hidden beast` number, since 8 + 0 + 581 + 6 + 0 + 9 + 1 + 61 = 666.

It can be written as a sum of positive squares in only one way, i.e., 413349561 + 80168259600 = 20331^2 + 283140^2 .

It is not a de Polignac number, because 80581609161 - 2¹ = 80581609159 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80581609261) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 2539051 + ... + 2570591.

Almost surely, 2^80581609161 is an apocalyptic number.

80581609161 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

80581609161 is the 283869-th square number.

80581609161 is the 141935-th centered octagonal number.

It is an amenable number.

80581609161 is a deficient number, since it is larger than the sum of its proper divisors (39797203822).

80581609161 is an frugal number, since it uses more digits than its factorization.

80581609161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63094 (or 31544 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 45.

The spelling of 80581609161 in words is "eighty billion, five hundred eighty-one million, six hundred nine thousand, one hundred sixty-one".