2505778331 has 4 divisors (see below), whose sum is σ = 2863746672. Its totient is φ = 2147809992.

The previous prime is 2505778307. The next prime is 2505778337. The reversal of 2505778331 is 1338775052.

2505778331 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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2505778331 is a prime.

It is a super-2 number, since 2×2505778331² = 12557850088218291122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2505778337) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 178984160 + ... + 178984173.

It is an arithmetic number, because the mean of its divisors is an integer number (715936668).

Almost surely, 2^2505778331 is an apocalyptic number.

2505778331 is a deficient number, since it is larger than the sum of its proper divisors (357968341).

2505778331 is an equidigital number, since it uses as much as digits as its factorization.

2505778331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357968340.

The product of its (nonzero) digits is 176400, while the sum is 41.

The square root of 2505778331 is about 50057.7499594219. The cubic root of 2505778331 is about 1358.2536572767.

The spelling of 2505778331 in words is "two billion, five hundred five million, seven hundred seventy-eight thousand, three hundred thirty-one".