1666685850 has 48 divisors (see below), whose sum is σ = 4136000160. Its totient is φ = 444168000.

The previous prime is 1666685837. The next prime is 1666685857. The reversal of 1666685850 is 585866661.

It is a super-6 number, since 6×1666685850⁶ (a number of 57 digits) contains 666666 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1666685793 and 1666685802.

It is not an unprimeable number, because it can be changed into a prime (1666685857) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 356025 + ... + 360675.

It is an arithmetic number, because the mean of its divisors is an integer number (86166670).

Almost surely, 2^1666685850 is an apocalyptic number.

1666685850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1666685850 is an abundant number, since it is smaller than the sum of its proper divisors (2469314310).

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

1666685850 is a wasteful number, since it uses less digits than its factorization.

1666685850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7055 (or 7050 counting only the distinct ones).

The product of its (nonzero) digits is 2073600, while the sum is 51.

The square root of 1666685850 is about 40825.0639926014. The cubic root of 1666685850 is about 1185.6356503506.

The spelling of 1666685850 in words is "one billion, six hundred sixty-six million, six hundred eighty-five thousand, eight hundred fifty".