2498938987861 has 2 divisors, whose sum is σ = 2498938987862. Its totient is φ = 2498938987860.

The previous prime is 2498938987771. The next prime is 2498938987889. The reversal of 2498938987861 is 1687898398942.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2405504838961 + 93434148900 = 1550969^2 + 305670^2 .

It is a cyclic number.

It is not a de Polignac number, because 2498938987861 - 2¹⁹ = 2498938463573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2498938927861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1249469493930 + 1249469493931.

It is an arithmetic number, because the mean of its divisors is an integer number (1249469493931).

Almost surely, 2^{2498938987861} is an apocalyptic number.

It is an amenable number.

2498938987861 is a deficient number, since it is larger than the sum of its proper divisors (1).

2498938987861 is an equidigital number, since it uses as much as digits as its factorization.

2498938987861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3009871872, while the sum is 82.

The spelling of 2498938987861 in words is "two trillion, four hundred ninety-eight billion, nine hundred thirty-eight million, nine hundred eighty-seven thousand, eight hundred sixty-one".