25340321639 has 4 divisors (see below), whose sum is σ = 25340931480. Its totient is φ = 25339711800.

The previous prime is 25340321627. The next prime is 25340321663. The reversal of 25340321639 is 93612304352.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25340321639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25340341639) 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, 237644 + ... + 327345.

It is an arithmetic number, because the mean of its divisors is an integer number (6335232870).

Almost surely, 2^25340321639 is an apocalyptic number.

25340321639 is a deficient number, since it is larger than the sum of its proper divisors (609841).

25340321639 is an equidigital number, since it uses as much as digits as its factorization.

25340321639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 609840.

The product of its (nonzero) digits is 116640, while the sum is 38.

The spelling of 25340321639 in words is "twenty-five billion, three hundred forty million, three hundred twenty-one thousand, six hundred thirty-nine".