25123558381 has 4 divisors (see below), whose sum is σ = 25126416000. Its totient is φ = 25120700764.

The previous prime is 25123558379. The next prime is 25123558417. The reversal of 25123558381 is 18385532152.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25123558381 - 2¹ = 25123558379 is a prime.

It is a super-2 number, since 2×25123558381² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25123558301) 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, 1415581 + ... + 1433218.

It is an arithmetic number, because the mean of its divisors is an integer number (6281604000).

Almost surely, 2^25123558381 is an apocalyptic number.

It is an amenable number.

25123558381 is a deficient number, since it is larger than the sum of its proper divisors (2857619).

25123558381 is an equidigital number, since it uses as much as digits as its factorization.

25123558381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2857618.

The product of its digits is 288000, while the sum is 43.

The spelling of 25123558381 in words is "twenty-five billion, one hundred twenty-three million, five hundred fifty-eight thousand, three hundred eighty-one".