1666666670 has 32 divisors (see below), whose sum is σ = 3073669632. Its totient is φ = 650335392.

The previous prime is 1666666667. The next prime is 1666666679. The reversal of 1666666670 is 766666661.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666666679) 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, 420719 + ... + 424661.

It is an arithmetic number, because the mean of its divisors is an integer number (96052176).

Almost surely, 2^1666666670 is an apocalyptic number.

1666666670 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1666666670 is a deficient number, since it is larger than the sum of its proper divisors (1407002962).

1666666670 is a wasteful number, since it uses less digits than its factorization.

1666666670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4976.

The product of its (nonzero) digits is 1959552, while the sum is 50.

The square root of 1666666670 is about 40824.8290872111. The cubic root of 1666666670 is about 1185.6311022871.

Subtracting from 1666666670 its reverse (766666661), we obtain a palindrome (900000009).

The spelling of 1666666670 in words is "one billion, six hundred sixty-six million, six hundred sixty-six thousand, six hundred seventy".