1666066512 has 40 divisors (see below), whose sum is σ = 4695279840. Its totient is φ = 504868480.

The previous prime is 1666066489. The next prime is 1666066513. The reversal of 1666066512 is 2156606661.

It is a super-2 number, since 2×1666066512² = 5551555244815692288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666066513) 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, 1577187 + ... + 1578242.

It is an arithmetic number, because the mean of its divisors is an integer number (117381996).

Almost surely, 2^1666066512 is an apocalyptic number.

1666066512 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1666066512 is an abundant number, since it is smaller than the sum of its proper divisors (3029213328).

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

1666066512 is a wasteful number, since it uses less digits than its factorization.

1666066512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3155451 (or 3155445 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 39.

The square root of 1666066512 is about 40817.4780210635. The cubic root of 1666066512 is about 1185.4887720037.

The spelling of 1666066512 in words is "one billion, six hundred sixty-six million, sixty-six thousand, five hundred twelve".