1660015510061 has 2 divisors, whose sum is σ = 1660015510062. Its totient is φ = 1660015510060.

The previous prime is 1660015510057. The next prime is 1660015510073. The reversal of 1660015510061 is 1600155100661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1004715546025 + 655299964036 = 1002355^2 + 809506^2 .

It is a cyclic number.

It is not a de Polignac number, because 1660015510061 - 2² = 1660015510057 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1660015510081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 830007755030 + 830007755031.

It is an arithmetic number, because the mean of its divisors is an integer number (830007755031).

Almost surely, 2^{1660015510061} is an apocalyptic number.

It is an amenable number.

1660015510061 is a deficient number, since it is larger than the sum of its proper divisors (1).

1660015510061 is an equidigital number, since it uses as much as digits as its factorization.

1660015510061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5400, while the sum is 32.

The spelling of 1660015510061 in words is "one trillion, six hundred sixty billion, fifteen million, five hundred ten thousand, sixty-one".