201661673 has 2 divisors, whose sum is σ = 201661674. Its totient is φ = 201661672.

The previous prime is 201661651. The next prime is 201661699. The reversal of 201661673 is 376166102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 157678249 + 43983424 = 12557^2 + 6632^2 .

It is a cyclic number.

It is not a de Polignac number, because 201661673 - 2⁶ = 201661609 is a prime.

It is not a weakly prime, because it can be changed into another prime (201661613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100830836 + 100830837.

It is an arithmetic number, because the mean of its divisors is an integer number (100830837).

Almost surely, 2^201661673 is an apocalyptic number.

It is an amenable number.

201661673 is a deficient number, since it is larger than the sum of its proper divisors (1).

201661673 is an equidigital number, since it uses as much as digits as its factorization.

201661673 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 201661673 is about 14200.7631132978. The cubic root of 201661673 is about 586.4186699674.

The spelling of 201661673 in words is "two hundred one million, six hundred sixty-one thousand, six hundred seventy-three".