209399080456 has 24 divisors (see below), whose sum is σ = 415729357470. Its totient is φ = 98538232448.

The previous prime is 209399080339. The next prime is 209399080477. The reversal of 209399080456 is 654080993902.

It is a happy number.

209399080456 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 153969912100 + 55429168356 = 392390^2 + 235434^2 .

It is a super-2 number, since 2×209399080456² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 209399080397 and 209399080406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5316885 + ... + 5356123.

Almost surely, 2^209399080456 is an apocalyptic number.

It is an amenable number.

209399080456 is a deficient number, since it is larger than the sum of its proper divisors (206330277014).

209399080456 is an frugal number, since it uses more digits than its factorization.

209399080456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78501 (or 39258 counting only the distinct ones).

The product of its (nonzero) digits is 4199040, while the sum is 55.

The spelling of 209399080456 in words is "two hundred nine billion, three hundred ninety-nine million, eighty thousand, four hundred fifty-six".