24999999998 has 4 divisors (see below), whose sum is σ = 37500000000. Its totient is φ = 12499999998.

The previous prime is 24999999991. The next prime is 25000000013. The reversal of 24999999998 is 89999999942.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 89999999942 = 2 ⋅44999999971.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (24999999991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6249999998 + ... + 6250000001.

It is an arithmetic number, because the mean of its divisors is an integer number (9375000000).

Almost surely, 2^24999999998 is an apocalyptic number.

24999999998 is a deficient number, since it is larger than the sum of its proper divisors (12500000002).

24999999998 is a wasteful number, since it uses less digits than its factorization.

24999999998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12500000001.

The product of its digits is 2754990144, while the sum is 86.

The spelling of 24999999998 in words is "twenty-four billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-eight".