1665630058681 has 12 divisors (see below), whose sum is σ = 1711994292540. Its totient is φ = 1620489461760.

The previous prime is 1665630058679. The next prime is 1665630058747. The reversal of 1665630058681 is 1868500365661.

It can be written as a sum of positive squares in 6 ways, for example, as 18013934656 + 1647616124025 = 134216^2 + 1283595^2 .

It is not a de Polignac number, because 1665630058681 - 2¹ = 1665630058679 is a prime.

It is a super-2 number, since 2×1665630058681² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1665630158681) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21604041 + ... + 21681001.

It is an arithmetic number, because the mean of its divisors is an integer number (142666191045).

Almost surely, 2^{1665630058681} is an apocalyptic number.

It is an amenable number.

1665630058681 is a deficient number, since it is larger than the sum of its proper divisors (46364233859).

1665630058681 is an equidigital number, since it uses as much as digits as its factorization.

1665630058681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92844 (or 92807 counting only the distinct ones).

The product of its (nonzero) digits is 6220800, while the sum is 55.

The spelling of 1665630058681 in words is "one trillion, six hundred sixty-five billion, six hundred thirty million, fifty-eight thousand, six hundred eighty-one".