1666515012 has 12 divisors (see below), whose sum is σ = 3888535056. Its totient is φ = 555505000.

The previous prime is 1666515007. The next prime is 1666515013. The reversal of 1666515012 is 2105156661.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (1666515013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69438114 + ... + 69438137.

It is an arithmetic number, because the mean of its divisors is an integer number (324044588).

Almost surely, 2^1666515012 is an apocalyptic number.

1666515012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1666515012 is an abundant number, since it is smaller than the sum of its proper divisors (2222020044).

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

1666515012 is a wasteful number, since it uses less digits than its factorization.

1666515012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138876258 (or 138876256 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 33.

The square root of 1666515012 is about 40822.9716213800. The cubic root of 1666515012 is about 1185.5951391080.

The spelling of 1666515012 in words is "one billion, six hundred sixty-six million, five hundred fifteen thousand, twelve".