1666345413 has 8 divisors (see below), whose sum is σ = 2226744000. Its totient is φ = 1108421888.

The previous prime is 1666345397. The next prime is 1666345453. The reversal of 1666345413 is 3145436661.

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 1666345413 - 2⁴ = 1666345397 is a prime.

It is a super-2 number, since 2×1666345413² = 5553414070852281138, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666345453) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 617193 + ... + 619886.

It is an arithmetic number, because the mean of its divisors is an integer number (278343000).

Almost surely, 2^1666345413 is an apocalyptic number.

It is an amenable number.

1666345413 is a deficient number, since it is larger than the sum of its proper divisors (560398587).

1666345413 is a wasteful number, since it uses less digits than its factorization.

1666345413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1237531.

The product of its digits is 155520, while the sum is 39.

The square root of 1666345413 is about 40820.8943189637. The cubic root of 1666345413 is about 1185.5549189340.

The spelling of 1666345413 in words is "one billion, six hundred sixty-six million, three hundred forty-five thousand, four hundred thirteen".