209208520866982 has 16 divisors (see below), whose sum is σ = 386231115447072. Its totient is φ = 82763810452800.

The previous prime is 209208520866973. The next prime is 209208520866991. The reversal of 209208520866982 is 289668025802902.

It is an interprime number because it is at equal distance from previous prime (209208520866973) and next prime (209208520866991).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 574748683519 + ... + 574748683882.

It is an arithmetic number, because the mean of its divisors is an integer number (24139444715442).

Almost surely, 2^{209208520866982} is an apocalyptic number.

209208520866982 is a deficient number, since it is larger than the sum of its proper divisors (177022594580090).

209208520866982 is a wasteful number, since it uses less digits than its factorization.

209208520866982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1149497367423.

The product of its (nonzero) digits is 119439360, while the sum is 67.

The spelling of 209208520866982 in words is "two hundred nine trillion, two hundred eight billion, five hundred twenty million, eight hundred sixty-six thousand, nine hundred eighty-two".