25321542039081 has 48 divisors (see below), whose sum is σ = 38554144108480. Its totient is φ = 15970313808000.

The previous prime is 25321542039077. The next prime is 25321542039091. The reversal of 25321542039081 is 18093024512352.

25321542039081 is a `hidden beast` number, since 2 + 5 + 3 + 21 + 542 + 0 + 3 + 9 + 0 + 81 = 666.

It is not a de Polignac number, because 25321542039081 - 2² = 25321542039077 is a prime.

It is a super-4 number, since 4×25321542039081⁴ (a number of 55 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25321542039041) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1306504011 + ... + 1306523391.

Almost surely, 2^{25321542039081} is an apocalyptic number.

It is an amenable number.

25321542039081 is a deficient number, since it is larger than the sum of its proper divisors (13232602069399).

25321542039081 is a wasteful number, since it uses less digits than its factorization.

25321542039081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29638 (or 29635 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 45.

The spelling of 25321542039081 in words is "twenty-five trillion, three hundred twenty-one billion, five hundred forty-two million, thirty-nine thousand, eighty-one".