208970983643 has 4 divisors (see below), whose sum is σ = 218056678608. Its totient is φ = 199885288680.

The previous prime is 208970983621. The next prime is 208970983657. The reversal of 208970983643 is 346389079802.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 208970983643 - 2³⁰ = 207897241819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (208970983673) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4542847448 + ... + 4542847493.

It is an arithmetic number, because the mean of its divisors is an integer number (54514169652).

Almost surely, 2^208970983643 is an apocalyptic number.

208970983643 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

208970983643 is a deficient number, since it is larger than the sum of its proper divisors (9085694965).

208970983643 is an equidigital number, since it uses as much as digits as its factorization.

208970983643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9085694964.

The product of its (nonzero) digits is 15676416, while the sum is 59.

The spelling of 208970983643 in words is "two hundred eight billion, nine hundred seventy million, nine hundred eighty-three thousand, six hundred forty-three".