203681166461 has 2 divisors, whose sum is σ = 203681166462. Its totient is φ = 203681166460.

The previous prime is 203681166443. The next prime is 203681166473. The reversal of 203681166461 is 164661186302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 188004624025 + 15676542436 = 433595^2 + 125206^2 .

It is a cyclic number.

It is not a de Polignac number, because 203681166461 - 2⁶ = 203681166397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (203681166361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101840583230 + 101840583231.

It is an arithmetic number, because the mean of its divisors is an integer number (101840583231).

Almost surely, 2^203681166461 is an apocalyptic number.

It is an amenable number.

203681166461 is a deficient number, since it is larger than the sum of its proper divisors (1).

203681166461 is an equidigital number, since it uses as much as digits as its factorization.

203681166461 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 248832, while the sum is 44.

The spelling of 203681166461 in words is "two hundred three billion, six hundred eighty-one million, one hundred sixty-six thousand, four hundred sixty-one".