199443061578 has 32 divisors (see below), whose sum is σ = 403606372032. Its totient is φ = 65696832000.

The previous prime is 199443061567. The next prime is 199443061633. The reversal of 199443061578 is 875160344991.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2298 + ... + 631578.

It is an arithmetic number, because the mean of its divisors is an integer number (12612699126).

Almost surely, 2^199443061578 is an apocalyptic number.

199443061578 is an abundant number, since it is smaller than the sum of its proper divisors (204163310454).

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

199443061578 is a wasteful number, since it uses less digits than its factorization.

199443061578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 629910.

The product of its (nonzero) digits is 6531840, while the sum is 57.

The spelling of 199443061578 in words is "one hundred ninety-nine billion, four hundred forty-three million, sixty-one thousand, five hundred seventy-eight".