199878863765 has 12 divisors (see below), whose sum is σ = 279014577516. Its totient is φ = 137059792128.

The previous prime is 199878863753. The next prime is 199878863797. The reversal of 199878863765 is 567368878991.

It can be written as a sum of positive squares in 2 ways, for example, as 46335576049 + 153543287716 = 215257^2 + 391846^2 .

It is not a de Polignac number, because 199878863765 - 2¹⁴ = 199878847381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 407915804 + ... + 407916293.

It is an arithmetic number, because the mean of its divisors is an integer number (23251214793).

Almost surely, 2^199878863765 is an apocalyptic number.

It is an amenable number.

199878863765 is a deficient number, since it is larger than the sum of its proper divisors (79135713751).

199878863765 is an equidigital number, since it uses as much as digits as its factorization.

199878863765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 815832116 (or 815832109 counting only the distinct ones).

The product of its digits is 1097349120, while the sum is 77.

The spelling of 199878863765 in words is "one hundred ninety-nine billion, eight hundred seventy-eight million, eight hundred sixty-three thousand, seven hundred sixty-five".