199861026674401 has 16 divisors (see below), whose sum is σ = 201748683584448. Its totient is φ = 197978918155200.

The previous prime is 199861026674371. The next prime is 199861026674431. The reversal of 199861026674401 is 104476620168991.

It is an interprime number because it is at equal distance from previous prime (199861026674371) and next prime (199861026674431).

It is a cyclic number.

It is not a de Polignac number, because 199861026674401 - 2³¹ = 199858879190753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199861026674431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 859053871 + ... + 859286491.

It is an arithmetic number, because the mean of its divisors is an integer number (12609292724028).

Almost surely, 2^{199861026674401} is an apocalyptic number.

It is an amenable number.

199861026674401 is a deficient number, since it is larger than the sum of its proper divisors (1887656910047).

199861026674401 is a wasteful number, since it uses less digits than its factorization.

199861026674401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244512.

The product of its (nonzero) digits is 31352832, while the sum is 64.

The spelling of 199861026674401 in words is "one hundred ninety-nine trillion, eight hundred sixty-one billion, twenty-six million, six hundred seventy-four thousand, four hundred one".