1666666701 has 24 divisors (see below), whose sum is σ = 2752401600. Its totient is φ = 952007616.

The previous prime is 1666666693. The next prime is 1666666711. The reversal of 1666666701 is 1076666661.

It is not a de Polignac number, because 1666666701 - 2³ = 1666666693 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666666711) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 282025 + ... + 287873.

It is an arithmetic number, because the mean of its divisors is an integer number (114683400).

Almost surely, 2^1666666701 is an apocalyptic number.

It is an amenable number.

1666666701 is a deficient number, since it is larger than the sum of its proper divisors (1085734899).

1666666701 is a wasteful number, since it uses less digits than its factorization.

1666666701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10385 (or 10382 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The square root of 1666666701 is about 40824.8294668820. The cubic root of 1666666701 is about 1185.6311096380.

The spelling of 1666666701 in words is "one billion, six hundred sixty-six million, six hundred sixty-six thousand, seven hundred one".