209969969902 has 64 divisors (see below), whose sum is σ = 395816813568. Its totient is φ = 81152640000.

The previous prime is 209969969899. The next prime is 209969969941.

It is a happy number.

209969969902 is nontrivially palindromic in base 10.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17969502 + ... + 17981182.

It is an arithmetic number, because the mean of its divisors is an integer number (6184637712).

Almost surely, 2^209969969902 is an apocalyptic number.

209969969902 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

209969969902 is a deficient number, since it is larger than the sum of its proper divisors (185846843666).

209969969902 is a wasteful number, since it uses less digits than its factorization.

209969969902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12625.

The product of its (nonzero) digits is 76527504, while the sum is 70.

The spelling of 209969969902 in words is "two hundred nine billion, nine hundred sixty-nine million, nine hundred sixty-nine thousand, nine hundred two".