1666526113 has 6 divisors (see below), whose sum is σ = 1938612066. Its totient is φ = 1428450912.

The previous prime is 1666526087. The next prime is 1666526123. The reversal of 1666526113 is 3116256661.

It can be written as a sum of positive squares in only one way, i.e., 1653479569 + 13046544 = 40663^2 + 3612^2 .

It is not a de Polignac number, because 1666526113 - 2¹³ = 1666517921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1666526123) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17005320 + ... + 17005417.

It is an arithmetic number, because the mean of its divisors is an integer number (323102011).

Almost surely, 2^1666526113 is an apocalyptic number.

It is an amenable number.

1666526113 is a deficient number, since it is larger than the sum of its proper divisors (272085953).

1666526113 is an equidigital number, since it uses as much as digits as its factorization.

1666526113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34010751 (or 34010744 counting only the distinct ones).

The product of its digits is 38880, while the sum is 37.

The square root of 1666526113 is about 40823.1075862679. The cubic root of 1666526113 is about 1185.5977716000.

It can be divided in two parts, 16665 and 26113, that added together give a triangular number (42778 = T₂₉₂).

The spelling of 1666526113 in words is "one billion, six hundred sixty-six million, five hundred twenty-six thousand, one hundred thirteen".