199044401778 has 48 divisors (see below), whose sum is σ = 437503809600. Its totient is φ = 65394288288.

The previous prime is 199044401771. The next prime is 199044401783. The reversal of 199044401778 is 877104440991.

199044401778 is a `hidden beast` number, since 199 + 0 + 4 + 440 + 1 + 7 + 7 + 8 = 666.

It is a super-2 number, since 2×199044401778² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (199044401771) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 117123 + ... + 641721.

It is an arithmetic number, because the mean of its divisors is an integer number (9114662700).

Almost surely, 2^199044401778 is an apocalyptic number.

199044401778 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

199044401778 is an abundant number, since it is smaller than the sum of its proper divisors (238459407822).

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

199044401778 is a wasteful number, since it uses less digits than its factorization.

199044401778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 524911 (or 524908 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 54.

The spelling of 199044401778 in words is "one hundred ninety-nine billion, forty-four million, four hundred one thousand, seven hundred seventy-eight".