77715642859 has 2 divisors, whose sum is σ = 77715642860. Its totient is φ = 77715642858.

The previous prime is 77715642847. The next prime is 77715642881. The reversal of 77715642859 is 95824651777.

It is a weak prime.

It is an emirp because it is prime and its reverse (95824651777) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77715642859 is a prime.

It is a super-2 number, since 2×77715642859² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 77715642797 and 77715642806.

It is not a weakly prime, because it can be changed into another prime (77715642959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38857821429 + 38857821430.

It is an arithmetic number, because the mean of its divisors is an integer number (38857821430).

Almost surely, 2^77715642859 is an apocalyptic number.

77715642859 is a deficient number, since it is larger than the sum of its proper divisors (1).

77715642859 is an equidigital number, since it uses as much as digits as its factorization.

77715642859 is an evil number, because the sum of its binary digits is even.

The product of its digits is 29635200, while the sum is 61.

The spelling of 77715642859 in words is "seventy-seven billion, seven hundred fifteen million, six hundred forty-two thousand, eight hundred fifty-nine".