24999999997 has 16 divisors (see below), whose sum is σ = 28730142720. Its totient is φ = 21309869808.

The previous prime is 24999999991. The next prime is 25000000013. The reversal of 24999999997 is 79999999942.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-24999999997 is a prime.

It is a Duffinian number.

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 in 15 ways as a sum of consecutive naturals, for example, 908718 + ... + 935824.

It is an arithmetic number, because the mean of its divisors is an integer number (1795633920).

Almost surely, 2^24999999997 is an apocalyptic number.

It is an amenable number.

24999999997 is a deficient number, since it is larger than the sum of its proper divisors (3730142723).

24999999997 is a wasteful number, since it uses less digits than its factorization.

24999999997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27840.

The product of its digits is 2410616376, while the sum is 85.

Subtracting 24999999997 from its reverse (79999999942), we obtain a palindrome (54999999945).

The spelling of 24999999997 in words is "twenty-four billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-seven".