209691154116 has 36 divisors (see below), whose sum is σ = 531212533852. Its totient is φ = 69744098304.

The previous prime is 209691154091. The next prime is 209691154117. The reversal of 209691154116 is 611451196902.

209691154116 is a `hidden beast` number, since 2 + 0 + 9 + 6 + 91 + 1 + 541 + 16 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 181557801216 + 28133352900 = 426096^2 + 167730^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×209691154116² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (209691154117) 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, 6356365 + ... + 6389268.

Almost surely, 2^209691154116 is an apocalyptic number.

It is an amenable number.

209691154116 is an abundant number, since it is smaller than the sum of its proper divisors (321521379736).

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

209691154116 is a wasteful number, since it uses less digits than its factorization.

209691154116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12746100 (or 12746095 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 45.

The spelling of 209691154116 in words is "two hundred nine billion, six hundred ninety-one million, one hundred fifty-four thousand, one hundred sixteen".