1666667373 has 8 divisors (see below), whose sum is σ = 2539683648. Its totient is φ = 952381344.

The previous prime is 1666667371. The next prime is 1666667383. The reversal of 1666667373 is 3737666661.

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

It is not a de Polignac number, because 1666667373 - 2¹ = 1666667371 is a prime.

It is a super-2 number, since 2×1666667373² = 5555560264445442258, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666667371) 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, 39682536 + ... + 39682577.

It is an arithmetic number, because the mean of its divisors is an integer number (317460456).

Almost surely, 2^1666667373 is an apocalyptic number.

It is an amenable number.

1666667373 is a deficient number, since it is larger than the sum of its proper divisors (873016275).

1666667373 is an equidigital number, since it uses as much as digits as its factorization.

1666667373 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79365123.

The product of its digits is 3429216, while the sum is 51.

The square root of 1666667373 is about 40824.8376971667. The cubic root of 1666667373 is about 1185.6312689868.

The spelling of 1666667373 in words is "one billion, six hundred sixty-six million, six hundred sixty-seven thousand, three hundred seventy-three".