209699968023 has 96 divisors (see below), whose sum is σ = 380082999296. Its totient is φ = 108465122304.

The previous prime is 209699968013. The next prime is 209699968033. The reversal of 209699968023 is 320869996902.

It is an interprime number because it is at equal distance from previous prime (209699968013) and next prime (209699968033).

It is a de Polignac number, because none of the positive numbers 2^k-209699968023 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209699968013) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 12228111 + ... + 12245247.

Almost surely, 2^209699968023 is an apocalyptic number.

209699968023 is a deficient number, since it is larger than the sum of its proper divisors (170383031273).

209699968023 is a wasteful number, since it uses less digits than its factorization.

209699968023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17453 (or 17450 counting only the distinct ones).

The product of its (nonzero) digits is 22674816, while the sum is 63.

The spelling of 209699968023 in words is "two hundred nine billion, six hundred ninety-nine million, nine hundred sixty-eight thousand, twenty-three".