2499981602809 has 2 divisors, whose sum is σ = 2499981602810. Its totient is φ = 2499981602808.

The previous prime is 2499981602737. The next prime is 2499981602813. The reversal of 2499981602809 is 9082061899942.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1859936802025 + 640044800784 = 1363795^2 + 800028^2 .

It is a cyclic number.

It is not a de Polignac number, because 2499981602809 - 2⁹ = 2499981602297 is a prime.

It is not a weakly prime, because it can be changed into another prime (2499981602309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1249990801404 + 1249990801405.

It is an arithmetic number, because the mean of its divisors is an integer number (1249990801405).

Almost surely, 2^{2499981602809} is an apocalyptic number.

It is an amenable number.

2499981602809 is a deficient number, since it is larger than the sum of its proper divisors (1).

2499981602809 is an equidigital number, since it uses as much as digits as its factorization.

2499981602809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40310784, while the sum is 67.

The spelling of 2499981602809 in words is "two trillion, four hundred ninety-nine billion, nine hundred eighty-one million, six hundred two thousand, eight hundred nine".