78427501111 has 4 divisors (see below), whose sum is σ = 78682965592. Its totient is φ = 78172036632.

The previous prime is 78427501109. The next prime is 78427501127. The reversal of 78427501111 is 11110572487.

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

It is a cyclic number.

It is not a de Polignac number, because 78427501111 - 2¹ = 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 (78427571111) 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, 127731780 + ... + 127732393.

It is an arithmetic number, because the mean of its divisors is an integer number (19670741398).

Almost surely, 2^78427501111 is an apocalyptic number.

78427501111 is a deficient number, since it is larger than the sum of its proper divisors (255464481).

78427501111 is a wasteful number, since it uses less digits than its factorization.

78427501111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255464480.

The product of its (nonzero) digits is 15680, while the sum is 37.

The spelling of 78427501111 in words is "seventy-eight billion, four hundred twenty-seven million, five hundred one thousand, one hundred eleven".