1666190397 has 8 divisors (see below), whose sum is σ = 2221793280. Its totient is φ = 1110690560.

The previous prime is 1666190353. The next prime is 1666190399. The reversal of 1666190397 is 7930916661.

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 1666190397 - 2⁷ = 1666190269 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666190399) 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 7 ways as a sum of consecutive naturals, for example, 27997 + ... + 64157.

It is an arithmetic number, because the mean of its divisors is an integer number (277724160).

Almost surely, 2^1666190397 is an apocalyptic number.

It is an amenable number.

1666190397 is a deficient number, since it is larger than the sum of its proper divisors (555602883).

1666190397 is a wasteful number, since it uses less digits than its factorization.

1666190397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51523.

The product of its (nonzero) digits is 367416, while the sum is 48.

The square root of 1666190397 is about 40818.9955412918. The cubic root of 1666190397 is about 1185.5181547115.

The spelling of 1666190397 in words is "one billion, six hundred sixty-six million, one hundred ninety thousand, three hundred ninety-seven".