201899813657 has 2 divisors, whose sum is σ = 201899813658. Its totient is φ = 201899813656.

The previous prime is 201899813627. The next prime is 201899813681. The reversal of 201899813657 is 756318998102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 104296056601 + 97603757056 = 322949^2 + 312416^2 .

It is a cyclic number.

It is not a de Polignac number, because 201899813657 - 2¹² = 201899809561 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201899813596 and 201899813605.

It is not a weakly prime, because it can be changed into another prime (201899813627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100949906828 + 100949906829.

It is an arithmetic number, because the mean of its divisors is an integer number (100949906829).

Almost surely, 2^201899813657 is an apocalyptic number.

It is an amenable number.

201899813657 is a deficient number, since it is larger than the sum of its proper divisors (1).

201899813657 is an equidigital number, since it uses as much as digits as its factorization.

201899813657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6531840, while the sum is 59.

The spelling of 201899813657 in words is "two hundred one billion, eight hundred ninety-nine million, eight hundred thirteen thousand, six hundred fifty-seven".