201661511039 has 2 divisors, whose sum is σ = 201661511040. Its totient is φ = 201661511038.

The previous prime is 201661510931. The next prime is 201661511053. The reversal of 201661511039 is 930115166102.

Together with previous prime (201661510931) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 201661511039 - 2⁸ = 201661510783 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201661511089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100830755519 + 100830755520.

It is an arithmetic number, because the mean of its divisors is an integer number (100830755520).

Almost surely, 2^201661511039 is an apocalyptic number.

201661511039 is a deficient number, since it is larger than the sum of its proper divisors (1).

201661511039 is an equidigital number, since it uses as much as digits as its factorization.

201661511039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9720, while the sum is 35.

The spelling of 201661511039 in words is "two hundred one billion, six hundred sixty-one million, five hundred eleven thousand, thirty-nine".