199969680601 has 4 divisors (see below), whose sum is σ = 200001064612. Its totient is φ = 199938296592.

The previous prime is 199969680587. The next prime is 199969680607. The reversal of 199969680601 is 106086969991.

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

It can be written as a sum of positive squares in 2 ways, for example, as 162007055001 + 37962625600 = 402501^2 + 194840^2 .

It is a cyclic number.

It is not a de Polignac number, because 199969680601 - 2¹⁹ = 199969156313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199969680607) 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, 15682446 + ... + 15695191.

It is an arithmetic number, because the mean of its divisors is an integer number (50000266153).

Almost surely, 2^199969680601 is an apocalyptic number.

It is an amenable number.

199969680601 is a deficient number, since it is larger than the sum of its proper divisors (31384011).

199969680601 is an equidigital number, since it uses as much as digits as its factorization.

199969680601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31384010.

The product of its (nonzero) digits is 11337408, while the sum is 64.

The spelling of 199969680601 in words is "one hundred ninety-nine billion, nine hundred sixty-nine million, six hundred eighty thousand, six hundred one".