1666323252 has 60 divisors (see below), whose sum is σ = 4752117216. Its totient is φ = 504945360.

The previous prime is 1666323227. The next prime is 1666323257. The reversal of 1666323252 is 2523236661.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666323257) 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 19 ways as a sum of consecutive naturals, for example, 230208 + ... + 237335.

Almost surely, 2^1666323252 is an apocalyptic number.

1666323252 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1666323252 is an abundant number, since it is smaller than the sum of its proper divisors (3085793964).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1666323252 is a wasteful number, since it uses less digits than its factorization.

1666323252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 467570 (or 467559 counting only the distinct ones).

The product of its digits is 77760, while the sum is 36.

The square root of 1666323252 is about 40820.6228761885. The cubic root of 1666323252 is about 1185.5496632811.

The spelling of 1666323252 in words is "one billion, six hundred sixty-six million, three hundred twenty-three thousand, two hundred fifty-two".