77338657531 has 2 divisors, whose sum is σ = 77338657532. Its totient is φ = 77338657530.

The previous prime is 77338657469. The next prime is 77338657537. The reversal of 77338657531 is 13575683377.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 77338657531 - 2¹⁵ = 77338624763 is a prime.

It is a super-2 number, since 2×77338657531² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (77338657537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38669328765 + 38669328766.

It is an arithmetic number, because the mean of its divisors is an integer number (38669328766).

Almost surely, 2^77338657531 is an apocalyptic number.

77338657531 is a deficient number, since it is larger than the sum of its proper divisors (1).

77338657531 is an equidigital number, since it uses as much as digits as its factorization.

77338657531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11113200, while the sum is 55.

The spelling of 77338657531 in words is "seventy-seven billion, three hundred thirty-eight million, six hundred fifty-seven thousand, five hundred thirty-one".