78806637781255 has 4 divisors (see below), whose sum is σ = 94567965337512. Its totient is φ = 63045310225000.

The previous prime is 78806637781231. The next prime is 78806637781279. The reversal of 78806637781255 is 55218773660887.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (78806637781231) and next prime (78806637781279).

It is not a de Polignac number, because 78806637781255 - 2³³ = 78798047846663 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7880663778121 + ... + 7880663778130.

It is an arithmetic number, because the mean of its divisors is an integer number (23641991334378).

Almost surely, 2^{78806637781255} is an apocalyptic number.

78806637781255 is a deficient number, since it is larger than the sum of its proper divisors (15761327556257).

78806637781255 is a wasteful number, since it uses less digits than its factorization.

78806637781255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15761327556256.

The product of its (nonzero) digits is 948326400, while the sum is 73.

The spelling of 78806637781255 in words is "seventy-eight trillion, eight hundred six billion, six hundred thirty-seven million, seven hundred eighty-one thousand, two hundred fifty-five".