78587285717 has 2 divisors, whose sum is σ = 78587285718. Its totient is φ = 78587285716.

The previous prime is 78587285713. The next prime is 78587285807. The reversal of 78587285717 is 71758278587.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76933562161 + 1653723556 = 277369^2 + 40666^2 .

It is a cyclic number.

It is not a de Polignac number, because 78587285717 - 2² = 78587285713 is a prime.

It is a super-2 number, since 2×78587285717² (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 (78587285713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39293642858 + 39293642859.

It is an arithmetic number, because the mean of its divisors is an integer number (39293642859).

Almost surely, 2^78587285717 is an apocalyptic number.

It is an amenable number.

78587285717 is a deficient number, since it is larger than the sum of its proper divisors (1).

78587285717 is an equidigital number, since it uses as much as digits as its factorization.

78587285717 is an evil number, because the sum of its binary digits is even.

The product of its digits is 61465600, while the sum is 65.

The spelling of 78587285717 in words is "seventy-eight billion, five hundred eighty-seven million, two hundred eighty-five thousand, seven hundred seventeen".