78173364593 has 2 divisors, whose sum is σ = 78173364594. Its totient is φ = 78173364592.

The previous prime is 78173364541. The next prime is 78173364601. The reversal of 78173364593 is 39546337187.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78121927009 + 51437584 = 279503^2 + 7172^2 .

It is a cyclic number.

It is not a de Polignac number, because 78173364593 - 2¹² = 78173360497 is a prime.

It is a super-2 number, since 2×78173364593² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78173364193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39086682296 + 39086682297.

It is an arithmetic number, because the mean of its divisors is an integer number (39086682297).

Almost surely, 2^78173364593 is an apocalyptic number.

It is an amenable number.

78173364593 is a deficient number, since it is larger than the sum of its proper divisors (1).

78173364593 is an equidigital number, since it uses as much as digits as its factorization.

78173364593 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11430720, while the sum is 56.

The spelling of 78173364593 in words is "seventy-eight billion, one hundred seventy-three million, three hundred sixty-four thousand, five hundred ninety-three".