78449441555 has 16 divisors (see below), whose sum is σ = 98639982144. Its totient is φ = 59781765120.

The previous prime is 78449441453. The next prime is 78449441591. The reversal of 78449441555 is 55514494487.

It is not a de Polignac number, because 78449441555 - 2¹⁸ = 78449179411 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78449441555.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1387574 + ... + 1443003.

It is an arithmetic number, because the mean of its divisors is an integer number (6164998884).

Almost surely, 2^78449441555 is an apocalyptic number.

78449441555 is a deficient number, since it is larger than the sum of its proper divisors (20190540589).

78449441555 is a wasteful number, since it uses less digits than its factorization.

78449441555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2830846.

The product of its digits is 16128000, while the sum is 56.

The spelling of 78449441555 in words is "seventy-eight billion, four hundred forty-nine million, four hundred forty-one thousand, five hundred fifty-five".