209271970755 has 12 divisors (see below), whose sum is σ = 362738082720. Its totient is φ = 111611717712.

The previous prime is 209271970753. The next prime is 209271970771. The reversal of 209271970755 is 557079172902.

It is a happy number.

It is not a de Polignac number, because 209271970755 - 2¹ = 209271970753 is a prime.

It is not an unprimeable number, because it can be changed into a prime (209271970753) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2325244075 + ... + 2325244164.

It is an arithmetic number, because the mean of its divisors is an integer number (30228173560).

Almost surely, 2^209271970755 is an apocalyptic number.

209271970755 is a deficient number, since it is larger than the sum of its proper divisors (153466111965).

209271970755 is a wasteful number, since it uses less digits than its factorization.

209271970755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4650488250 (or 4650488247 counting only the distinct ones).

The product of its (nonzero) digits is 2778300, while the sum is 54.

The spelling of 209271970755 in words is "two hundred nine billion, two hundred seventy-one million, nine hundred seventy thousand, seven hundred fifty-five".