25499899452 has 24 divisors (see below), whose sum is σ = 60088874832. Its totient is φ = 8415808000.

The previous prime is 25499899409. The next prime is 25499899459.

It is a happy number.

25499899452 is nontrivially palindromic in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25499899459) 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, 10518549 + ... + 10520972.

It is an arithmetic number, because the mean of its divisors is an integer number (2503703118).

Almost surely, 2^25499899452 is an apocalyptic number.

It is an amenable number.

25499899452 is an abundant number, since it is smaller than the sum of its proper divisors (34588975380).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25499899452 is a wasteful number, since it uses less digits than its factorization.

25499899452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21039629 (or 21039627 counting only the distinct ones).

The product of its digits is 83980800, while the sum is 66.

The spelling of 25499899452 in words is "twenty-five billion, four hundred ninety-nine million, eight hundred ninety-nine thousand, four hundred fifty-two".