7187443666 has 16 divisors (see below), whose sum is σ = 11740944600. Its totient is φ = 3280007808.

The previous prime is 7187443663. The next prime is 7187443687. The reversal of 7187443666 is 6663447817.

It can be written as a sum of positive squares in 4 ways, for example, as 4521890025 + 2665553641 = 67245^2 + 51629^2 .

It is not an unprimeable number, because it can be changed into a prime (7187443663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1550721 + ... + 1555348.

Almost surely, 2^7187443666 is an apocalyptic number.

7187443666 is a deficient number, since it is larger than the sum of its proper divisors (4553500934).

7187443666 is a wasteful number, since it uses less digits than its factorization.

7187443666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3106173.

The product of its digits is 4064256, while the sum is 52.

The square root of 7187443666 is about 84778.7925486085. The cubic root of 7187443666 is about 1929.8556153901.

The spelling of 7187443666 in words is "seven billion, one hundred eighty-seven million, four hundred forty-three thousand, six hundred sixty-six".