2561077499 has 4 divisors (see below), whose sum is σ = 2561249664. Its totient is φ = 2560905336.

The previous prime is 2561077483. The next prime is 2561077511. The reversal of 2561077499 is 9947701652.

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 2561077499 - 2⁴ = 2561077483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2561077199) 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, 61412 + ... + 94305.

It is an arithmetic number, because the mean of its divisors is an integer number (640312416).

Almost surely, 2^2561077499 is an apocalyptic number.

2561077499 is a deficient number, since it is larger than the sum of its proper divisors (172165).

2561077499 is a wasteful number, since it uses less digits than its factorization.

2561077499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172164.

The product of its (nonzero) digits is 952560, while the sum is 50.

The square root of 2561077499 is about 50607.0894144289. The cubic root of 2561077499 is about 1368.1726572301.

The spelling of 2561077499 in words is "two billion, five hundred sixty-one million, seventy-seven thousand, four hundred ninety-nine".