24999533981 has 2 divisors, whose sum is σ = 24999533982. Its totient is φ = 24999533980.

The previous prime is 24999533927. The next prime is 24999534017. The reversal of 24999533981 is 18933599942.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21333231481 + 3666302500 = 146059^2 + 60550^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-24999533981 is a prime.

It is a super-2 number, since 2×24999533981² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (24999503981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12499766990 + 12499766991.

It is an arithmetic number, because the mean of its divisors is an integer number (12499766991).

Almost surely, 2^24999533981 is an apocalyptic number.

It is an amenable number.

24999533981 is a deficient number, since it is larger than the sum of its proper divisors (1).

24999533981 is an equidigital number, since it uses as much as digits as its factorization.

24999533981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18895680, while the sum is 62.

The spelling of 24999533981 in words is "twenty-four billion, nine hundred ninety-nine million, five hundred thirty-three thousand, nine hundred eighty-one".