78751774752389 has 2 divisors, whose sum is σ = 78751774752390. Its totient is φ = 78751774752388.

The previous prime is 78751774752349. The next prime is 78751774752473. The reversal of 78751774752389 is 98325747715787.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76055666580100 + 2696108172289 = 8720990^2 + 1641983^2 .

It is a cyclic number.

It is not a de Polignac number, because 78751774752389 - 2²⁴ = 78751757975173 is a prime.

It is a super-2 number, since 2×78751774752389² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78751774752349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39375887376194 + 39375887376195.

It is an arithmetic number, because the mean of its divisors is an integer number (39375887376195).

Almost surely, 2^{78751774752389} is an apocalyptic number.

It is an amenable number.

78751774752389 is a deficient number, since it is larger than the sum of its proper divisors (1).

78751774752389 is an equidigital number, since it uses as much as digits as its factorization.

78751774752389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5808499200, while the sum is 80.

The spelling of 78751774752389 in words is "seventy-eight trillion, seven hundred fifty-one billion, seven hundred seventy-four million, seven hundred fifty-two thousand, three hundred eighty-nine".