201870185161 has 2 divisors, whose sum is σ = 201870185162. Its totient is φ = 201870185160.

The previous prime is 201870185131. The next prime is 201870185203. The reversal of 201870185161 is 161581078102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 162989838400 + 38880346761 = 403720^2 + 197181^2 .

It is a cyclic number.

It is not a de Polignac number, because 201870185161 - 2¹³ = 201870176969 is a prime.

It is not a weakly prime, because it can be changed into another prime (201870185131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100935092580 + 100935092581.

It is an arithmetic number, because the mean of its divisors is an integer number (100935092581).

Almost surely, 2^201870185161 is an apocalyptic number.

It is an amenable number.

201870185161 is a deficient number, since it is larger than the sum of its proper divisors (1).

201870185161 is an equidigital number, since it uses as much as digits as its factorization.

201870185161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26880, while the sum is 40.

The spelling of 201870185161 in words is "two hundred one billion, eight hundred seventy million, one hundred eighty-five thousand, one hundred sixty-one".