8131776147487 has 2 divisors, whose sum is σ = 8131776147488. Its totient is φ = 8131776147486.

The previous prime is 8131776147463. The next prime is 8131776147527. The reversal of 8131776147487 is 7847416771318.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8131776147487 is a prime.

It is a super-2 number, since 2×8131776147487² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8131776147427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4065888073743 + 4065888073744.

It is an arithmetic number, because the mean of its divisors is an integer number (4065888073744).

Almost surely, 2^{8131776147487} is an apocalyptic number.

8131776147487 is a deficient number, since it is larger than the sum of its proper divisors (1).

8131776147487 is an equidigital number, since it uses as much as digits as its factorization.

8131776147487 is an evil number, because the sum of its binary digits is even.

The product of its digits is 44255232, while the sum is 64.

The spelling of 8131776147487 in words is "eight trillion, one hundred thirty-one billion, seven hundred seventy-six million, one hundred forty-seven thousand, four hundred eighty-seven".