209157885092 has 24 divisors (see below), whose sum is σ = 394222144512. Its totient is φ = 96524618400.

The previous prime is 209157885091. The next prime is 209157885103. The reversal of 209157885092 is 290588751902.

It is not an unprimeable number, because it can be changed into a prime (209157885091) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 326867 + ... + 724677.

It is an arithmetic number, because the mean of its divisors is an integer number (16425922688).

Almost surely, 2^209157885092 is an apocalyptic number.

It is an amenable number.

209157885092 is a deficient number, since it is larger than the sum of its proper divisors (185064259420).

209157885092 is a wasteful number, since it uses less digits than its factorization.

209157885092 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407939 (or 407937 counting only the distinct ones).

The product of its (nonzero) digits is 3628800, while the sum is 56.

The spelling of 209157885092 in words is "two hundred nine billion, one hundred fifty-seven million, eight hundred eighty-five thousand, ninety-two".