1601778319199 has 4 divisors (see below), whose sum is σ = 1601977083720. Its totient is φ = 1601579554680.

The previous prime is 1601778319177. The next prime is 1601778319217. The reversal of 1601778319199 is 9919138771061.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1601778319199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1601771319199) 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, 99370172 + ... + 99386289.

It is an arithmetic number, because the mean of its divisors is an integer number (400494270930).

Almost surely, 2^{1601778319199} is an apocalyptic number.

1601778319199 is a deficient number, since it is larger than the sum of its proper divisors (198764521).

1601778319199 is an equidigital number, since it uses as much as digits as its factorization.

1601778319199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198764520.

The product of its (nonzero) digits is 5143824, while the sum is 62.

The spelling of 1601778319199 in words is "one trillion, six hundred one billion, seven hundred seventy-eight million, three hundred nineteen thousand, one hundred ninety-nine".