199123217418 has 64 divisors (see below), whose sum is σ = 418411008000. Its totient is φ = 63087837120.

The previous prime is 199123217401. The next prime is 199123217483. The reversal of 199123217418 is 814712321991.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8425983 + ... + 8449581.

It is an arithmetic number, because the mean of its divisors is an integer number (6537672000).

Almost surely, 2^199123217418 is an apocalyptic number.

199123217418 is an abundant number, since it is smaller than the sum of its proper divisors (219287790582).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

199123217418 is a wasteful number, since it uses less digits than its factorization.

199123217418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24387.

The product of its digits is 217728, while the sum is 48.

The spelling of 199123217418 in words is "one hundred ninety-nine billion, one hundred twenty-three million, two hundred seventeen thousand, four hundred eighteen".