199807905401 has 8 divisors (see below), whose sum is σ = 215194064904. Its totient is φ = 184424077440.

The previous prime is 199807905377. The next prime is 199807905403. The reversal of 199807905401 is 104509708991.

It can be written as a sum of positive squares in 4 ways, for example, as 9711905401 + 190096000000 = 98549^2 + 436000^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 199807905401 - 2¹⁰ = 199807904377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (199807905403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 402830 + ... + 749591.

It is an arithmetic number, because the mean of its divisors is an integer number (26899258113).

Almost surely, 2^199807905401 is an apocalyptic number.

It is an amenable number.

199807905401 is a deficient number, since it is larger than the sum of its proper divisors (15386159503).

199807905401 is a wasteful number, since it uses less digits than its factorization.

199807905401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1165771.

The product of its (nonzero) digits is 816480, while the sum is 53.

The spelling of 199807905401 in words is "one hundred ninety-nine billion, eight hundred seven million, nine hundred five thousand, four hundred one".