25420689331 has 4 divisors (see below), whose sum is σ = 25487062272. Its totient is φ = 25354316392.

The previous prime is 25420689317. The next prime is 25420689341. The reversal of 25420689331 is 13398602452.

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 25420689331 - 2⁹ = 25420688819 is a prime.

It is a super-2 number, since 2×25420689331² (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 (25420689341) 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, 33185896 + ... + 33186661.

It is an arithmetic number, because the mean of its divisors is an integer number (6371765568).

Almost surely, 2^25420689331 is an apocalyptic number.

25420689331 is a deficient number, since it is larger than the sum of its proper divisors (66372941).

25420689331 is an equidigital number, since it uses as much as digits as its factorization.

25420689331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66372940.

The product of its (nonzero) digits is 311040, while the sum is 43.

The spelling of 25420689331 in words is "twenty-five billion, four hundred twenty million, six hundred eighty-nine thousand, three hundred thirty-one".