78417614657 has 2 divisors, whose sum is σ = 78417614658. Its totient is φ = 78417614656.

The previous prime is 78417614647. The next prime is 78417614659. The reversal of 78417614657 is 75641671487.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40964140816 + 37453473841 = 202396^2 + 193529^2 .

It is a cyclic number.

It is not a de Polignac number, because 78417614657 - 2¹⁶ = 78417549121 is a prime.

It is a super-2 number, since 2×78417614657² (a number of 23 digits) contains 22 as substring.

Together with 78417614659, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78417614659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39208807328 + 39208807329.

It is an arithmetic number, because the mean of its divisors is an integer number (39208807329).

Almost surely, 2^78417614657 is an apocalyptic number.

It is an amenable number.

78417614657 is a deficient number, since it is larger than the sum of its proper divisors (1).

78417614657 is an equidigital number, since it uses as much as digits as its factorization.

78417614657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7902720, while the sum is 56.

The spelling of 78417614657 in words is "seventy-eight billion, four hundred seventeen million, six hundred fourteen thousand, six hundred fifty-seven".