76887998581 has 2 divisors, whose sum is σ = 76887998582. Its totient is φ = 76887998580.

The previous prime is 76887998549. The next prime is 76887998641. The reversal of 76887998581 is 18589978867.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61310712100 + 15577286481 = 247610^2 + 124809^2 .

It is a cyclic number.

It is not a de Polignac number, because 76887998581 - 2⁵ = 76887998549 is a prime.

It is a super-2 number, since 2×76887998581² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 76887998498 and 76887998507.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (76887998521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38443999290 + 38443999291.

It is an arithmetic number, because the mean of its divisors is an integer number (38443999291).

Almost surely, 2^76887998581 is an apocalyptic number.

It is an amenable number.

76887998581 is a deficient number, since it is larger than the sum of its proper divisors (1).

76887998581 is an equidigital number, since it uses as much as digits as its factorization.

76887998581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 487710720, while the sum is 76.

The spelling of 76887998581 in words is "seventy-six billion, eight hundred eighty-seven million, nine hundred ninety-eight thousand, five hundred eighty-one".