1666747734 has 16 divisors (see below), whose sum is σ = 3373659072. Its totient is φ = 548888648.

The previous prime is 1666747723. The next prime is 1666747741. The reversal of 1666747734 is 4377476661.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent 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, 1672944 + ... + 1673939.

It is an arithmetic number, because the mean of its divisors is an integer number (210853692).

Almost surely, 2^1666747734 is an apocalyptic number.

1666747734 is an abundant number, since it is smaller than the sum of its proper divisors (1706911338).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1666747734 is a wasteful number, since it uses less digits than its factorization.

1666747734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3346971.

The product of its digits is 3556224, while the sum is 51.

The square root of 1666747734 is about 40825.8219023206. The cubic root of 1666747734 is about 1185.6503243754.

The spelling of 1666747734 in words is "one billion, six hundred sixty-six million, seven hundred forty-seven thousand, seven hundred thirty-four".