209255970357 has 12 divisors (see below), whose sum is σ = 345438427360. Its totient is φ = 119574840168.

The previous prime is 209255970353. The next prime is 209255970373. The reversal of 209255970357 is 753079552902.

209255970357 is a `hidden beast` number, since 20 + 9 + 25 + 597 + 0 + 3 + 5 + 7 = 666.

It is not a de Polignac number, because 209255970357 - 2² = 209255970353 is a prime.

It is a super-2 number, since 2×209255970357² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209255970353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1660761607 + ... + 1660761732.

Almost surely, 2^209255970357 is an apocalyptic number.

It is an amenable number.

209255970357 is a deficient number, since it is larger than the sum of its proper divisors (136182457003).

209255970357 is a wasteful number, since it uses less digits than its factorization.

209255970357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3321523352 (or 3321523349 counting only the distinct ones).

The product of its (nonzero) digits is 5953500, while the sum is 54.

The spelling of 209255970357 in words is "two hundred nine billion, two hundred fifty-five million, nine hundred seventy thousand, three hundred fifty-seven".