2561525239819 has 16 divisors (see below), whose sum is σ = 3237853114048. Its totient is φ = 1971925575552.

The previous prime is 2561525239783. The next prime is 2561525239837. The reversal of 2561525239819 is 9189325251652.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2561525239819 is a prime.

It is a super-2 number, since 2×2561525239819² (a number of 26 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2561525239849) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 380383512 + ... + 380390245.

It is an arithmetic number, because the mean of its divisors is an integer number (202365819628).

Almost surely, 2^{2561525239819} is an apocalyptic number.

2561525239819 is a deficient number, since it is larger than the sum of its proper divisors (676327874229).

2561525239819 is a wasteful number, since it uses less digits than its factorization.

2561525239819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 760773814.

The product of its digits is 11664000, while the sum is 58.

The spelling of 2561525239819 in words is "two trillion, five hundred sixty-one billion, five hundred twenty-five million, two hundred thirty-nine thousand, eight hundred nineteen".