2561490742499 has 32 divisors (see below), whose sum is σ = 2927807608320. Its totient is φ = 2223799142400.

The previous prime is 2561490742469. The next prime is 2561490742553. The reversal of 2561490742499 is 9942470941652.

It is a cyclic number.

It is not a de Polignac number, because 2561490742499 - 2¹⁶ = 2561490676963 is a prime.

It is a super-2 number, since 2×2561490742499² (a number of 26 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2561490742469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13039097 + ... + 13234085.

It is an arithmetic number, because the mean of its divisors is an integer number (91493987760).

Almost surely, 2^{2561490742499} is an apocalyptic number.

2561490742499 is a deficient number, since it is larger than the sum of its proper divisors (366316865821).

2561490742499 is a wasteful number, since it uses less digits than its factorization.

2561490742499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195951.

The product of its (nonzero) digits is 39191040, while the sum is 62.

The spelling of 2561490742499 in words is "two trillion, five hundred sixty-one billion, four hundred ninety million, seven hundred forty-two thousand, four hundred ninety-nine".