208403117643 has 16 divisors (see below), whose sum is σ = 318451253760. Its totient is φ = 118755771456.

The previous prime is 208403117621. The next prime is 208403117651. The reversal of 208403117643 is 346711304802.

It is not a de Polignac number, because 208403117643 - 2⁶ = 208403117579 is a prime.

It is not an unprimeable number, because it can be changed into a prime (208403117443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13814130 + ... + 13829207.

It is an arithmetic number, because the mean of its divisors is an integer number (19903203360).

Almost surely, 2^208403117643 is an apocalyptic number.

208403117643 is a deficient number, since it is larger than the sum of its proper divisors (110048136117).

208403117643 is a wasteful number, since it uses less digits than its factorization.

208403117643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27643706.

The product of its (nonzero) digits is 96768, while the sum is 39.

The spelling of 208403117643 in words is "two hundred eight billion, four hundred three million, one hundred seventeen thousand, six hundred forty-three".