25420917361 has 16 divisors (see below), whose sum is σ = 30896844160. Its totient is φ = 20429729280.

The previous prime is 25420917349. The next prime is 25420917367. The reversal of 25420917361 is 16371902452.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 25420917361 - 2¹¹ = 25420915313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25420917367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 972330 + ... + 998131.

It is an arithmetic number, because the mean of its divisors is an integer number (1931052760).

Almost surely, 2^25420917361 is an apocalyptic number.

It is an amenable number.

25420917361 is a deficient number, since it is larger than the sum of its proper divisors (5475926799).

25420917361 is a wasteful number, since it uses less digits than its factorization.

25420917361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1970584.

The product of its (nonzero) digits is 90720, while the sum is 40.

It can be divided in two parts, 2542091 and 7361, that added together give a palindrome (2549452).

The spelling of 25420917361 in words is "twenty-five billion, four hundred twenty million, nine hundred seventeen thousand, three hundred sixty-one".