78427501117 has 4 divisors (see below), whose sum is σ = 89631429856. Its totient is φ = 67223572380.

The previous prime is 78427501109. The next prime is 78427501127. The reversal of 78427501117 is 71110572487.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 78427501117 - 2³ = 78427501109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78427501127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5601964359 + ... + 5601964372.

It is an arithmetic number, because the mean of its divisors is an integer number (22407857464).

Almost surely, 2^78427501117 is an apocalyptic number.

It is an amenable number.

78427501117 is a deficient number, since it is larger than the sum of its proper divisors (11203928739).

78427501117 is a wasteful number, since it uses less digits than its factorization.

78427501117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11203928738.

The product of its (nonzero) digits is 109760, while the sum is 43.

The spelling of 78427501117 in words is "seventy-eight billion, four hundred twenty-seven million, five hundred one thousand, one hundred seventeen".