78914469857 has 2 divisors, whose sum is σ = 78914469858. Its totient is φ = 78914469856.

The previous prime is 78914469839. The next prime is 78914469917. The reversal of 78914469857 is 75896441987.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73150775296 + 5763694561 = 270464^2 + 75919^2 .

It is a cyclic number.

It is not a de Polignac number, because 78914469857 - 2¹⁴ = 78914453473 is a prime.

It is a super-2 number, since 2×78914469857² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78914469827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39457234928 + 39457234929.

It is an arithmetic number, because the mean of its divisors is an integer number (39457234929).

Almost surely, 2^78914469857 is an apocalyptic number.

It is an amenable number.

78914469857 is a deficient number, since it is larger than the sum of its proper divisors (1).

78914469857 is an equidigital number, since it uses as much as digits as its factorization.

78914469857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 121927680, while the sum is 68.

The spelling of 78914469857 in words is "seventy-eight billion, nine hundred fourteen million, four hundred sixty-nine thousand, eight hundred fifty-seven".