1666330637 has 8 divisors (see below), whose sum is σ = 1683321240. Its totient is φ = 1649424960.

The previous prime is 1666330613. The next prime is 1666330639. The reversal of 1666330637 is 7360336661.

It can be written as a sum of positive squares in 4 ways, for example, as 1506914761 + 159415876 = 38819^2 + 12626^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1666330637 - 2⁶ = 1666330573 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1666330594 and 1666330603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666330639) 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, 18587 + ... + 60647.

It is an arithmetic number, because the mean of its divisors is an integer number (210415155).

Almost surely, 2^1666330637 is an apocalyptic number.

It is an amenable number.

1666330637 is a deficient number, since it is larger than the sum of its proper divisors (16990603).

1666330637 is a wasteful number, since it uses less digits than its factorization.

1666330637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42463.

The product of its (nonzero) digits is 244944, while the sum is 41.

The square root of 1666330637 is about 40820.7133328167. The cubic root of 1666330637 is about 1185.5514146963.

The spelling of 1666330637 in words is "one billion, six hundred sixty-six million, three hundred thirty thousand, six hundred thirty-seven".