77986137108427 has 2 divisors, whose sum is σ = 77986137108428. Its totient is φ = 77986137108426.

The previous prime is 77986137108413. The next prime is 77986137108449. The reversal of 77986137108427 is 72480173168977.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77986137108427 is a prime.

It is not a weakly prime, because it can be changed into another prime (77986137109427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38993068554213 + 38993068554214.

It is an arithmetic number, because the mean of its divisors is an integer number (38993068554214).

Almost surely, 2^{77986137108427} is an apocalyptic number.

77986137108427 is a deficient number, since it is larger than the sum of its proper divisors (1).

77986137108427 is an equidigital number, since it uses as much as digits as its factorization.

77986137108427 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 199148544, while the sum is 70.

The spelling of 77986137108427 in words is "seventy-seven trillion, nine hundred eighty-six billion, one hundred thirty-seven million, one hundred eight thousand, four hundred twenty-seven".