25428498499 has 4 divisors (see below), whose sum is σ = 25428882064. Its totient is φ = 25428114936.

The previous prime is 25428498497. The next prime is 25428498541. The reversal of 25428498499 is 99489482452.

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 25428498499 - 2¹ = 25428498497 is a prime.

It is a deceptive number, since it divides R_25428498498.

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 25428498499.

It is not an unprimeable number, because it can be changed into a prime (25428498497) 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, 63927 + ... + 234400.

It is an arithmetic number, because the mean of its divisors is an integer number (6357220516).

Almost surely, 2^25428498499 is an apocalyptic number.

25428498499 is the 85237-th nonagonal number.

25428498499 is a deficient number, since it is larger than the sum of its proper divisors (383565).

25428498499 is an equidigital number, since it uses as much as digits as its factorization.

25428498499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383564.

The product of its digits is 59719680, while the sum is 64.

The spelling of 25428498499 in words is "twenty-five billion, four hundred twenty-eight million, four hundred ninety-eight thousand, four hundred ninety-nine".