209161089636 has 48 divisors (see below), whose sum is σ = 524463662016. Its totient is φ = 64639770624.

The previous prime is 209161089623. The next prime is 209161089659. The reversal of 209161089636 is 636980161902.

209161089636 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×209161089636² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7637821 + ... + 7665156.

It is an arithmetic number, because the mean of its divisors is an integer number (10926326292).

Almost surely, 2^209161089636 is an apocalyptic number.

It is an amenable number.

209161089636 is an abundant number, since it is smaller than the sum of its proper divisors (315302572380).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

209161089636 is a wasteful number, since it uses less digits than its factorization.

209161089636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15303068 (or 15303066 counting only the distinct ones).

The product of its (nonzero) digits is 839808, while the sum is 51.

The spelling of 209161089636 in words is "two hundred nine billion, one hundred sixty-one million, eighty-nine thousand, six hundred thirty-six".