101781397643539 has 2 divisors, whose sum is σ = 101781397643540. Its totient is φ = 101781397643538.

The previous prime is 101781397643507. The next prime is 101781397643543. The reversal of 101781397643539 is 935346793187101.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 101781397643539 - 2⁵ = 101781397643507 is a prime.

It is not a weakly prime, because it can be changed into another prime (101781397643579) 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, 50890698821769 + 50890698821770.

It is an arithmetic number, because the mean of its divisors is an integer number (50890698821770).

Almost surely, 2^{101781397643539} is an apocalyptic number.

101781397643539 is a deficient number, since it is larger than the sum of its proper divisors (1).

101781397643539 is an equidigital number, since it uses as much as digits as its factorization.

101781397643539 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 102876480, while the sum is 67.

The spelling of 101781397643539 in words is "one hundred one trillion, seven hundred eighty-one billion, three hundred ninety-seven million, six hundred forty-three thousand, five hundred thirty-nine".