1612878666 has 16 divisors (see below), whose sum is σ = 3686579904. Its totient is φ = 460822464.

The previous prime is 1612878637. The next prime is 1612878679. The reversal of 1612878666 is 6668782161.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19200895 + ... + 19200978.

It is an arithmetic number, because the mean of its divisors is an integer number (230411244).

Almost surely, 2^1612878666 is an apocalyptic number.

1612878666 is an abundant number, since it is smaller than the sum of its proper divisors (2073701238).

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

1612878666 is a wasteful number, since it uses less digits than its factorization.

1612878666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38401885.

The product of its digits is 1161216, while the sum is 51.

The square root of 1612878666 is about 40160.6606768365. The cubic root of 1612878666 is about 1172.7368336362.

The spelling of 1612878666 in words is "one billion, six hundred twelve million, eight hundred seventy-eight thousand, six hundred sixty-six".