25450542451 has 4 divisors (see below), whose sum is σ = 25515968400. Its totient is φ = 25385116504.

The previous prime is 25450542449. The next prime is 25450542457. The reversal of 25450542451 is 15424505452.

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 25450542451 - 2¹ = 25450542449 is a prime.

It is a super-2 number, since 2×25450542451² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25450542451.

It is not an unprimeable number, because it can be changed into a prime (25450542457) 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, 32712391 + ... + 32713168.

It is an arithmetic number, because the mean of its divisors is an integer number (6378992100).

Almost surely, 2^25450542451 is an apocalyptic number.

25450542451 is a deficient number, since it is larger than the sum of its proper divisors (65425949).

25450542451 is an equidigital number, since it uses as much as digits as its factorization.

25450542451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65425948.

The product of its (nonzero) digits is 160000, while the sum is 37.

The spelling of 25450542451 in words is "twenty-five billion, four hundred fifty million, five hundred forty-two thousand, four hundred fifty-one".