78551417522 has 18 divisors (see below), whose sum is σ = 119893738143. Its totient is φ = 38598524284.

The previous prime is 78551417509. The next prime is 78551417537. The reversal of 78551417522 is 22571415587.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 39275708761 + 39275708761 = 198181^2 + 198181^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=198181.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 23383679 + ... + 23387037.

Almost surely, 2^78551417522 is an apocalyptic number.

78551417522 is a deficient number, since it is larger than the sum of its proper divisors (41342320621).

78551417522 is an frugal number, since it uses more digits than its factorization.

78551417522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6838 (or 3420 counting only the distinct ones).

The product of its digits is 784000, while the sum is 47.

The spelling of 78551417522 in words is "seventy-eight billion, five hundred fifty-one million, four hundred seventeen thousand, five hundred twenty-two".