199669999601 has 2 divisors, whose sum is σ = 199669999602. Its totient is φ = 199669999600.

The previous prime is 199669999597. The next prime is 199669999621. The reversal of 199669999601 is 106999966991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 115430742001 + 84239257600 = 339751^2 + 290240^2 .

It is a cyclic number.

It is not a de Polignac number, because 199669999601 - 2² = 199669999597 is a prime.

It is not a weakly prime, because it can be changed into another prime (199669999621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99834999800 + 99834999801.

It is an arithmetic number, because the mean of its divisors is an integer number (99834999801).

Almost surely, 2^199669999601 is an apocalyptic number.

It is an amenable number.

199669999601 is a deficient number, since it is larger than the sum of its proper divisors (1).

199669999601 is an equidigital number, since it uses as much as digits as its factorization.

199669999601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 114791256, while the sum is 74.

The spelling of 199669999601 in words is "one hundred ninety-nine billion, six hundred sixty-nine million, nine hundred ninety-nine thousand, six hundred one".