2505277779 has 4 divisors (see below), whose sum is σ = 3340370376. Its totient is φ = 1670185184.

The previous prime is 2505277769. The next prime is 2505277787. The reversal of 2505277779 is 9777725052.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2505277779 - 2²⁷ = 2371060051 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2505277769) 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, 417546294 + ... + 417546299.

It is an arithmetic number, because the mean of its divisors is an integer number (835092594).

Almost surely, 2^2505277779 is an apocalyptic number.

2505277779 is a deficient number, since it is larger than the sum of its proper divisors (835092597).

2505277779 is an equidigital number, since it uses as much as digits as its factorization.

2505277779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 835092596.

The product of its (nonzero) digits is 2160900, while the sum is 51.

The square root of 2505277779 is about 50052.7499644125. The cubic root of 2505277779 is about 1358.1632100822.

It can be divided in two parts, 25052 and 77779, that added together give a triangular number (102831 = T₄₅₃).

The spelling of 2505277779 in words is "two billion, five hundred five million, two hundred seventy-seven thousand, seven hundred seventy-nine".