1666115001 has 20 divisors (see below), whose sum is σ = 2490434100. Its totient is φ = 1110053376.

The previous prime is 1666114999. The next prime is 1666115029. The reversal of 1666115001 is 1005116661.

It can be written as a sum of positive squares in 2 ways, for example, as 344065401 + 1322049600 = 18549^2 + 36360^2 .

It is not a de Polignac number, because 1666115001 - 2¹ = 1666114999 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1666115201) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 147565 + ... + 158453.

It is an arithmetic number, because the mean of its divisors is an integer number (124521705).

Almost surely, 2^1666115001 is an apocalyptic number.

It is an amenable number.

1666115001 is a deficient number, since it is larger than the sum of its proper divisors (824319099).

1666115001 is a wasteful number, since it uses less digits than its factorization.

1666115001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12790 (or 12781 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 1666115001 is about 40818.0719902349. The cubic root of 1666115001 is about 1185.5002726665.

The spelling of 1666115001 in words is "one billion, six hundred sixty-six million, one hundred fifteen thousand, one".