1666995051 has 8 divisors (see below), whose sum is σ = 2243433024. Its totient is φ = 1100943560.

The previous prime is 1666995047. The next prime is 1666995059. The reversal of 1666995051 is 1505996661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1666995051 - 2² = 1666995047 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1666995059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2596245 + ... + 2596886.

It is an arithmetic number, because the mean of its divisors is an integer number (280429128).

Almost surely, 2^1666995051 is an apocalyptic number.

1666995051 is a deficient number, since it is larger than the sum of its proper divisors (576437973).

1666995051 is a wasteful number, since it uses less digits than its factorization.

1666995051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5193241.

The product of its (nonzero) digits is 437400, while the sum is 48.

The square root of 1666995051 is about 40828.8507185789. The cubic root of 1666995051 is about 1185.7089649189.

The spelling of 1666995051 in words is "one billion, six hundred sixty-six million, nine hundred ninety-five thousand, fifty-one".