78777140737 has 2 divisors, whose sum is σ = 78777140738. Its totient is φ = 78777140736.

The previous prime is 78777140723. The next prime is 78777140749. The reversal of 78777140737 is 73704177787.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73587955441 + 5189185296 = 271271^2 + 72036^2 .

It is a cyclic number.

It is not a de Polignac number, because 78777140737 - 2³⁵ = 44417402369 is a prime.

It is not a weakly prime, because it can be changed into another prime (78777140237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39388570368 + 39388570369.

It is an arithmetic number, because the mean of its divisors is an integer number (39388570369).

Almost surely, 2^78777140737 is an apocalyptic number.

It is an amenable number.

78777140737 is a deficient number, since it is larger than the sum of its proper divisors (1).

78777140737 is an equidigital number, since it uses as much as digits as its factorization.

78777140737 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11294304, while the sum is 58.

The spelling of 78777140737 in words is "seventy-eight billion, seven hundred seventy-seven million, one hundred forty thousand, seven hundred thirty-seven".