80666461917 has 6 divisors (see below), whose sum is σ = 116518222782. Its totient is φ = 53777641272.

The previous prime is 80666461907. The next prime is 80666461937. The reversal of 80666461917 is 71916466608.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 78836846841 + 1829615076 = 280779^2 + 42774^2 .

It is not a de Polignac number, because 80666461917 - 2⁸ = 80666461661 is a prime.

It is a super-2 number, since 2×80666461917² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80666461907) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4481470098 + ... + 4481470115.

It is an arithmetic number, because the mean of its divisors is an integer number (19419703797).

Almost surely, 2^80666461917 is an apocalyptic number.

It is an amenable number.

80666461917 is a deficient number, since it is larger than the sum of its proper divisors (35851760865).

80666461917 is a wasteful number, since it uses less digits than its factorization.

80666461917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8962940219 (or 8962940216 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 54.

The spelling of 80666461917 in words is "eighty billion, six hundred sixty-six million, four hundred sixty-one thousand, nine hundred seventeen".