78625522555 has 4 divisors (see below), whose sum is σ = 94350627072. Its totient is φ = 62900418040.

The previous prime is 78625522537. The next prime is 78625522559. The reversal of 78625522555 is 55522552687.

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

It is not a de Polignac number, because 78625522555 - 2⁵ = 78625522523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78625522559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7862552251 + ... + 7862552260.

It is an arithmetic number, because the mean of its divisors is an integer number (23587656768).

Almost surely, 2^78625522555 is an apocalyptic number.

78625522555 is a deficient number, since it is larger than the sum of its proper divisors (15725104517).

78625522555 is a wasteful number, since it uses less digits than its factorization.

78625522555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15725104516.

The product of its digits is 8400000, while the sum is 52.

The spelling of 78625522555 in words is "seventy-eight billion, six hundred twenty-five million, five hundred twenty-two thousand, five hundred fifty-five".