25509469798 has 4 divisors (see below), whose sum is σ = 38264204700. Its totient is φ = 12754734898.

The previous prime is 25509469793. The next prime is 25509469837. The reversal of 25509469798 is 89796490552.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25509469793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6377367448 + ... + 6377367451.

It is an arithmetic number, because the mean of its divisors is an integer number (9566051175).

Almost surely, 2^25509469798 is an apocalyptic number.

25509469798 is a deficient number, since it is larger than the sum of its proper divisors (12754734902).

25509469798 is a wasteful number, since it uses less digits than its factorization.

25509469798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12754734901.

The product of its (nonzero) digits is 48988800, while the sum is 64.

The spelling of 25509469798 in words is "twenty-five billion, five hundred nine million, four hundred sixty-nine thousand, seven hundred ninety-eight".