78626054291 has 4 divisors (see below), whose sum is σ = 78662987400. Its totient is φ = 78589121184.

The previous prime is 78626054209. The next prime is 78626054303. The reversal of 78626054291 is 19245062687.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78626054291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78626054491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18463361 + ... + 18467618.

It is an arithmetic number, because the mean of its divisors is an integer number (19665746850).

Almost surely, 2^78626054291 is an apocalyptic number.

78626054291 is a deficient number, since it is larger than the sum of its proper divisors (36933109).

78626054291 is a wasteful number, since it uses less digits than its factorization.

78626054291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36933108.

The product of its (nonzero) digits is 1451520, while the sum is 50.

The spelling of 78626054291 in words is "seventy-eight billion, six hundred twenty-six million, fifty-four thousand, two hundred ninety-one".