209188750856 has 8 divisors (see below), whose sum is σ = 392228907870. Its totient is φ = 104594375424.

The previous prime is 209188750831. The next prime is 209188750877. The reversal of 209188750856 is 658057881902.

It can be written as a sum of positive squares in only one way, i.e., 185029022500 + 24159728356 = 430150^2 + 155434^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 209188750795 and 209188750804.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13074296921 + ... + 13074296936.

Almost surely, 2^209188750856 is an apocalyptic number.

It is an amenable number.

209188750856 is a deficient number, since it is larger than the sum of its proper divisors (183040157014).

209188750856 is a wasteful number, since it uses less digits than its factorization.

209188750856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26148593863 (or 26148593859 counting only the distinct ones).

The product of its (nonzero) digits is 9676800, while the sum is 59.

The spelling of 209188750856 in words is "two hundred nine billion, one hundred eighty-eight million, seven hundred fifty thousand, eight hundred fifty-six".