1666732851 has 12 divisors (see below), whose sum is σ = 2751432112. Its totient is φ = 952418736.

The previous prime is 1666732849. The next prime is 1666732867. The reversal of 1666732851 is 1582376661.

It is not a de Polignac number, because 1666732851 - 2¹ = 1666732849 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1666732797 and 1666732806.

It is not an unprimeable number, because it can be changed into a prime (1666732811) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13227976 + ... + 13228101.

Almost surely, 2^1666732851 is an apocalyptic number.

1666732851 is a deficient number, since it is larger than the sum of its proper divisors (1084699261).

1666732851 is a wasteful number, since it uses less digits than its factorization.

1666732851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26456090 (or 26456087 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 1666732851 is about 40825.6396275674. The cubic root of 1666732851 is about 1185.6467953298.

The spelling of 1666732851 in words is "one billion, six hundred sixty-six million, seven hundred thirty-two thousand, eight hundred fifty-one".