25420445521 has 8 divisors (see below), whose sum is σ = 26028063360. Its totient is φ = 24815609328.

The previous prime is 25420445509. The next prime is 25420445599. The reversal of 25420445521 is 12554402452.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25420445521 - 2¹¹ = 25420443473 is a prime.

It is a super-2 number, since 2×25420445521² (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 (25420745521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 676911 + ... + 713476.

It is an arithmetic number, because the mean of its divisors is an integer number (3253507920).

Almost surely, 2^25420445521 is an apocalyptic number.

It is an amenable number.

25420445521 is a deficient number, since it is larger than the sum of its proper divisors (607617839).

25420445521 is a wasteful number, since it uses less digits than its factorization.

25420445521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1390823.

The product of its (nonzero) digits is 64000, while the sum is 34.

Adding to 25420445521 its reverse (12554402452), we get a palindrome (37974847973).

The spelling of 25420445521 in words is "twenty-five billion, four hundred twenty million, four hundred forty-five thousand, five hundred twenty-one".