201664603643 has 2 divisors, whose sum is σ = 201664603644. Its totient is φ = 201664603642.

The previous prime is 201664603603. The next prime is 201664603697. The reversal of 201664603643 is 346306466102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 201664603643 - 2²² = 201660409339 is a prime.

It is a super-2 number, since 2×201664603643² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 201664603643.

It is not a weakly prime, because it can be changed into another prime (201664603603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100832301821 + 100832301822.

It is an arithmetic number, because the mean of its divisors is an integer number (100832301822).

Almost surely, 2^201664603643 is an apocalyptic number.

201664603643 is a deficient number, since it is larger than the sum of its proper divisors (1).

201664603643 is an equidigital number, since it uses as much as digits as its factorization.

201664603643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 373248, while the sum is 41.

The spelling of 201664603643 in words is "two hundred one billion, six hundred sixty-four million, six hundred three thousand, six hundred forty-three".