80660898661 has 6 divisors (see below), whose sum is σ = 93830025030. Its totient is φ = 69137913096.

The previous prime is 80660898653. The next prime is 80660898691. The reversal of 80660898661 is 16689806608.

It can be written as a sum of positive squares in only one way, i.e., 53496914436 + 27163984225 = 231294^2 + 164815^2 .

It is not a de Polignac number, because 80660898661 - 2³ = 80660898653 is a prime.

It is a super-2 number, since 2×80660898661² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 80660898596 and 80660898605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80660898691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 823070346 + ... + 823070443.

It is an arithmetic number, because the mean of its divisors is an integer number (15638337505).

Almost surely, 2^80660898661 is an apocalyptic number.

It is an amenable number.

80660898661 is a deficient number, since it is larger than the sum of its proper divisors (13169126369).

80660898661 is a wasteful number, since it uses less digits than its factorization.

80660898661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1646140803 (or 1646140796 counting only the distinct ones).

The product of its (nonzero) digits is 5971968, while the sum is 58.

The spelling of 80660898661 in words is "eighty billion, six hundred sixty million, eight hundred ninety-eight thousand, six hundred sixty-one".