25442581787 has 6 divisors (see below), whose sum is σ = 29596472748. Its totient is φ = 21807927204.

The previous prime is 25442581757. The next prime is 25442581799. The reversal of 25442581787 is 78718524452.

It is not a de Polignac number, because 25442581787 - 2¹² = 25442577691 is a prime.

It is a super-2 number, since 2×25442581787² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25442581757) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 259618133 + ... + 259618230.

It is an arithmetic number, because the mean of its divisors is an integer number (4932745458).

Almost surely, 2^25442581787 is an apocalyptic number.

25442581787 is a deficient number, since it is larger than the sum of its proper divisors (4153890961).

25442581787 is an equidigital number, since it uses as much as digits as its factorization.

25442581787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 519236377 (or 519236370 counting only the distinct ones).

The product of its digits is 5017600, while the sum is 53.

The spelling of 25442581787 in words is "twenty-five billion, four hundred forty-two million, five hundred eighty-one thousand, seven hundred eighty-seven".