64778274255 has 32 divisors (see below), whose sum is σ = 107239320000. Its totient is φ = 33350833152.

The previous prime is 64778274247. The next prime is 64778274271. The reversal of 64778274255 is 55247287746.

64778274255 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 64778274255 - 2³ = 64778274247 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 64778274195 and 64778274204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3111621 + ... + 3132369.

It is an arithmetic number, because the mean of its divisors is an integer number (3351228750).

Almost surely, 2^64778274255 is an apocalyptic number.

64778274255 is a deficient number, since it is larger than the sum of its proper divisors (42461045745).

64778274255 is a wasteful number, since it uses less digits than its factorization.

64778274255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27963.

The product of its digits is 26342400, while the sum is 57.

The spelling of 64778274255 in words is "sixty-four billion, seven hundred seventy-eight million, two hundred seventy-four thousand, two hundred fifty-five".