865135862779 has 2 divisors, whose sum is σ = 865135862780. Its totient is φ = 865135862778.

The previous prime is 865135862777. The next prime is 865135862861. The reversal of 865135862779 is 977268531568.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 865135862779 - 2¹ = 865135862777 is a prime.

It is a super-2 number, since 2×865135862779² (a number of 25 digits) contains 22 as substring.

Together with 865135862777, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (865135862777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432567931389 + 432567931390.

It is an arithmetic number, because the mean of its divisors is an integer number (432567931390).

Almost surely, 2^865135862779 is an apocalyptic number.

865135862779 is a deficient number, since it is larger than the sum of its proper divisors (1).

865135862779 is an equidigital number, since it uses as much as digits as its factorization.

865135862779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 152409600, while the sum is 67.

The spelling of 865135862779 in words is "eight hundred sixty-five billion, one hundred thirty-five million, eight hundred sixty-two thousand, seven hundred seventy-nine".