1666612142 has 32 divisors (see below), whose sum is σ = 2787907584. Its totient is φ = 742024800.

The previous prime is 1666612099. The next prime is 1666612147. The reversal of 1666612142 is 2412166661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666612147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 263663 + ... + 269909.

It is an arithmetic number, because the mean of its divisors is an integer number (87122112).

Almost surely, 2^1666612142 is an apocalyptic number.

1666612142 is a deficient number, since it is larger than the sum of its proper divisors (1121295442).

1666612142 is a wasteful number, since it uses less digits than its factorization.

1666612142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6624.

The product of its digits is 20736, while the sum is 35.

The square root of 1666612142 is about 40824.1612528659. The cubic root of 1666612142 is about 1185.6181721276.

The spelling of 1666612142 in words is "one billion, six hundred sixty-six million, six hundred twelve thousand, one hundred forty-two".