1981502868859 has 2 divisors, whose sum is σ = 1981502868860. Its totient is φ = 1981502868858.

The previous prime is 1981502868853. The next prime is 1981502868869. The reversal of 1981502868859 is 9588682051891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1981502868859 - 2⁹ = 1981502868347 is a prime.

It is not a weakly prime, because it can be changed into another prime (1981502868853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 990751434429 + 990751434430.

It is an arithmetic number, because the mean of its divisors is an integer number (990751434430).

Almost surely, 2^{1981502868859} is an apocalyptic number.

1981502868859 is a deficient number, since it is larger than the sum of its proper divisors (1).

1981502868859 is an equidigital number, since it uses as much as digits as its factorization.

1981502868859 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 99532800, while the sum is 70.

The spelling of 1981502868859 in words is "one trillion, nine hundred eighty-one billion, five hundred two million, eight hundred sixty-eight thousand, eight hundred fifty-nine".