25140055643 has 4 divisors (see below), whose sum is σ = 25232823648. Its totient is φ = 25047287640.

The previous prime is 25140055639. The next prime is 25140055663. The reversal of 25140055643 is 34655004152.

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 25140055643 - 2² = 25140055639 is a prime.

It is a super-2 number, since 2×25140055643² (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 (25140055663) 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, 46383596 + ... + 46384137.

It is an arithmetic number, because the mean of its divisors is an integer number (6308205912).

Almost surely, 2^25140055643 is an apocalyptic number.

25140055643 is a deficient number, since it is larger than the sum of its proper divisors (92768005).

25140055643 is an equidigital number, since it uses as much as digits as its factorization.

25140055643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92768004.

The product of its (nonzero) digits is 72000, while the sum is 35.

Adding to 25140055643 its reverse (34655004152), we get a palindrome (59795059795).

The spelling of 25140055643 in words is "twenty-five billion, one hundred forty million, fifty-five thousand, six hundred forty-three".