1666657323 has 16 divisors (see below), whose sum is σ = 2471392800. Its totient is φ = 1110083040.

The previous prime is 1666657313. The next prime is 1666657327. The reversal of 1666657323 is 3237566661.

1666657323 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1666657323 - 2¹² = 1666653227 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1666657327) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2113 + ... + 57773.

It is an arithmetic number, because the mean of its divisors is an integer number (154462050).

Almost surely, 2^1666657323 is an apocalyptic number.

1666657323 is a deficient number, since it is larger than the sum of its proper divisors (804735477).

1666657323 is a wasteful number, since it uses less digits than its factorization.

1666657323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56779 (or 56773 counting only the distinct ones).

The product of its digits is 816480, while the sum is 45.

The square root of 1666657323 is about 40824.7146101476. The cubic root of 1666657323 is about 1185.6288858642.

The spelling of 1666657323 in words is "one billion, six hundred sixty-six million, six hundred fifty-seven thousand, three hundred twenty-three".