49875557778 has 18 divisors (see below), whose sum is σ = 108065761479. Its totient is φ = 16624870092.

The previous prime is 49875557741. The next prime is 49875557789. The reversal of 49875557778 is 87775557894.

It is a happy number.

49875557778 is a `hidden beast` number, since 49 + 8 + 7 + 5 + 5 + 577 + 7 + 8 = 666.

49875557778 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 24937778889 + 24937778889 = 157917^2 + 157917^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=157917.

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, 921183 + ... + 973821.

Almost surely, 2^49875557778 is an apocalyptic number.

49875557778 is an abundant number, since it is smaller than the sum of its proper divisors (58190203701).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

49875557778 is an frugal number, since it uses more digits than its factorization.

49875557778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105286 (or 52644 counting only the distinct ones).

The product of its digits is 691488000, while the sum is 72.

Multiplying 49875557778 by its sum of digits (72), we get a square (3591040160016 = 1895004²).

The spelling of 49875557778 in words is "forty-nine billion, eight hundred seventy-five million, five hundred fifty-seven thousand, seven hundred seventy-eight".