77536863631 has 2 divisors, whose sum is σ = 77536863632. Its totient is φ = 77536863630.

The previous prime is 77536863491. The next prime is 77536863647. The reversal of 77536863631 is 13636863577.

It is a strong prime.

It is an emirp because it is prime and its reverse (13636863577) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77536863631 is a prime.

It is a super-2 number, since 2×77536863631² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77536863661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38768431815 + 38768431816.

It is an arithmetic number, because the mean of its divisors is an integer number (38768431816).

Almost surely, 2^77536863631 is an apocalyptic number.

77536863631 is a deficient number, since it is larger than the sum of its proper divisors (1).

77536863631 is an equidigital number, since it uses as much as digits as its factorization.

77536863631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11430720, while the sum is 55.

The spelling of 77536863631 in words is "seventy-seven billion, five hundred thirty-six million, eight hundred sixty-three thousand, six hundred thirty-one".