80537331681 has 9 divisors (see below), whose sum is σ = 116332931091. Its totient is φ = 53690986872.

The previous prime is 80537331673. The next prime is 80537331781. The reversal of 80537331681 is 18613373508.

The square root of 80537331681 is 283791.

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

80537331681 is a `hidden beast` number, since 8 + 0 + 537 + 3 + 31 + 6 + 81 = 666.

It can be written as a sum of positive squares in only one way, i.e., 77297900625 + 3239431056 = 278025^2 + 56916^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 80537331681 - 2³ = 80537331673 is a prime.

It is a super-2 number, since 2×80537331681² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (80537331661) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 804075 + ... + 898671.

Almost surely, 2^80537331681 is an apocalyptic number.

80537331681 is the 283791-st square number.

80537331681 is the 141896-th centered octagonal number.

It is an amenable number.

80537331681 is a deficient number, since it is larger than the sum of its proper divisors (35795599410).

80537331681 is an frugal number, since it uses more digits than its factorization.

80537331681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189200 (or 94600 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The spelling of 80537331681 in words is "eighty billion, five hundred thirty-seven million, three hundred thirty-one thousand, six hundred eighty-one".