80621625681 has 12 divisors (see below), whose sum is σ = 116479857780. Its totient is φ = 53735566560.

The previous prime is 80621625677. The next prime is 80621625703. The reversal of 80621625681 is 18652612608.

80621625681 is a `hidden beast` number, since 8 + 0 + 6 + 21 + 62 + 568 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 24338808081 + 56282817600 = 156009^2 + 237240^2 .

It is not a de Polignac number, because 80621625681 - 2² = 80621625677 is a prime.

It is a super-2 number, since 2×80621625681² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (80621625611) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 973326 + ... + 1052903.

It is an arithmetic number, because the mean of its divisors is an integer number (9706654815).

Almost surely, 2^80621625681 is an apocalyptic number.

It is an amenable number.

80621625681 is a deficient number, since it is larger than the sum of its proper divisors (35858232099).

80621625681 is a wasteful number, since it uses less digits than its factorization.

80621625681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2030656 (or 2030653 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The spelling of 80621625681 in words is "eighty billion, six hundred twenty-one million, six hundred twenty-five thousand, six hundred eighty-one".