209400808688 has 10 divisors (see below), whose sum is σ = 405714066864. Its totient is φ = 104700404336.

The previous prime is 209400808679. The next prime is 209400808697. The reversal of 209400808688 is 886808004902.

It is an interprime number because it is at equal distance from previous prime (209400808679) and next prime (209400808697).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6543775256 + ... + 6543775287.

Almost surely, 2^209400808688 is an apocalyptic number.

It is an amenable number.

209400808688 is a deficient number, since it is larger than the sum of its proper divisors (196313258176).

209400808688 is a wasteful number, since it uses less digits than its factorization.

209400808688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13087550551 (or 13087550545 counting only the distinct ones).

The product of its (nonzero) digits is 1769472, while the sum is 53.

The spelling of 209400808688 in words is "two hundred nine billion, four hundred million, eight hundred eight thousand, six hundred eighty-eight".