1665116570 has 16 divisors (see below), whose sum is σ = 3227764680. Its totient is φ = 614812224.

The previous prime is 1665116569. The next prime is 1665116597. The reversal of 1665116570 is 756115661.

It can be written as a sum of positive squares in 4 ways, for example, as 856908529 + 808208041 = 29273^2 + 28429^2 .

It is a super-2 number, since 2×1665116570² = 5545226383377129800, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6404165 + ... + 6404424.

Almost surely, 2^1665116570 is an apocalyptic number.

1665116570 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1665116570 is a deficient number, since it is larger than the sum of its proper divisors (1562648110).

1665116570 is a wasteful number, since it uses less digits than its factorization.

1665116570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12808609.

The product of its (nonzero) digits is 37800, while the sum is 38.

The square root of 1665116570 is about 40805.8399006809. The cubic root of 1665116570 is about 1185.2634189207.

Subtracting from 1665116570 its reverse (756115661), we obtain a palindrome (909000909).

The spelling of 1665116570 in words is "one billion, six hundred sixty-five million, one hundred sixteen thousand, five hundred seventy".