78000099257 has 2 divisors, whose sum is σ = 78000099258. Its totient is φ = 78000099256.

The previous prime is 78000099181. The next prime is 78000099263. The reversal of 78000099257 is 75299000087.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52393378816 + 25606720441 = 228896^2 + 160021^2 .

It is a cyclic number.

It is not a de Polignac number, because 78000099257 - 2¹⁰ = 78000098233 is a prime.

It is not a weakly prime, because it can be changed into another prime (78000090257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39000049628 + 39000049629.

It is an arithmetic number, because the mean of its divisors is an integer number (39000049629).

Almost surely, 2^78000099257 is an apocalyptic number.

It is an amenable number.

78000099257 is a deficient number, since it is larger than the sum of its proper divisors (1).

78000099257 is an equidigital number, since it uses as much as digits as its factorization.

78000099257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 317520, while the sum is 47.

The spelling of 78000099257 in words is "seventy-eight billion, ninety-nine thousand, two hundred fifty-seven".