1666455612 has 12 divisors (see below), whose sum is σ = 3888396456. Its totient is φ = 555485200.

The previous prime is 1666455611. The next prime is 1666455631. The reversal of 1666455612 is 2165546661.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666455611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69435639 + ... + 69435662.

It is an arithmetic number, because the mean of its divisors is an integer number (324033038).

Almost surely, 2^1666455612 is an apocalyptic number.

1666455612 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1666455612 is an abundant number, since it is smaller than the sum of its proper divisors (2221940844).

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

1666455612 is a wasteful number, since it uses less digits than its factorization.

1666455612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138871308 (or 138871306 counting only the distinct ones).

The product of its digits is 259200, while the sum is 42.

The square root of 1666455612 is about 40822.2440833426. The cubic root of 1666455612 is about 1185.5810527886.

The spelling of 1666455612 in words is "one billion, six hundred sixty-six million, four hundred fifty-five thousand, six hundred twelve".