1666724746 has 16 divisors (see below), whose sum is σ = 2522419200. Its totient is φ = 825951888.

The previous prime is 1666724729. The next prime is 1666724747. The reversal of 1666724746 is 6474276661.

It is a self number, because there is not a number n which added to its sum of digits gives 1666724746.

It is not an unprimeable number, because it can be changed into a prime (1666724747) 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, 93975 + ... + 110293.

It is an arithmetic number, because the mean of its divisors is an integer number (157651200).

Almost surely, 2^1666724746 is an apocalyptic number.

1666724746 is a deficient number, since it is larger than the sum of its proper divisors (855694454).

1666724746 is a wasteful number, since it uses less digits than its factorization.

1666724746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16773.

The product of its digits is 2032128, while the sum is 49.

The square root of 1666724746 is about 40825.5403638458. The cubic root of 1666724746 is about 1185.6448734695.

The spelling of 1666724746 in words is "one billion, six hundred sixty-six million, seven hundred twenty-four thousand, seven hundred forty-six".