47777751685 has 4 divisors (see below), whose sum is σ = 57333302028. Its totient is φ = 38222201344.

The previous prime is 47777751661. The next prime is 47777751737. The reversal of 47777751685 is 58615777774.

47777751685 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58615777774 = 2 ⋅29307888887.

It can be written as a sum of positive squares in 2 ways, for example, as 30599455329 + 17178296356 = 174927^2 + 131066^2 .

It is a cyclic number.

It is not a de Polignac number, because 47777751685 - 2⁵ = 47777751653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4777775164 + ... + 4777775173.

It is an arithmetic number, because the mean of its divisors is an integer number (14333325507).

Almost surely, 2^47777751685 is an apocalyptic number.

It is an amenable number.

47777751685 is a deficient number, since it is larger than the sum of its proper divisors (9555550343).

47777751685 is an equidigital number, since it uses as much as digits as its factorization.

47777751685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9555550342.

The product of its digits is 80673600, while the sum is 64.

The spelling of 47777751685 in words is "forty-seven billion, seven hundred seventy-seven million, seven hundred fifty-one thousand, six hundred eighty-five".