1666685352 has 16 divisors (see below), whose sum is σ = 4166713440. Its totient is φ = 555561776.

The previous prime is 1666685351. The next prime is 1666685399. The reversal of 1666685352 is 2535866661.

It is not an unprimeable number, because it can be changed into a prime (1666685351) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34722588 + ... + 34722635.

It is an arithmetic number, because the mean of its divisors is an integer number (260419590).

Almost surely, 2^1666685352 is an apocalyptic number.

1666685352 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1666685352 is an abundant number, since it is smaller than the sum of its proper divisors (2500028088).

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

1666685352 is a wasteful number, since it uses less digits than its factorization.

1666685352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69445232 (or 69445228 counting only the distinct ones).

The product of its digits is 1555200, while the sum is 48.

The square root of 1666685352 is about 40825.0578934066. The cubic root of 1666685352 is about 1185.6355322626.

The spelling of 1666685352 in words is "one billion, six hundred sixty-six million, six hundred eighty-five thousand, three hundred fifty-two".