17666668420 has 24 divisors (see below), whose sum is σ = 37113615000. Its totient is φ = 7064074752.

The previous prime is 17666668381. The next prime is 17666668421. The reversal of 17666668420 is 2486666671.

It can be written as a sum of positive squares in 4 ways, for example, as 992628036 + 16674040384 = 31506^2 + 129128^2 .

It is a super-2 number, since 2×17666668420² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (17666668421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 105685 + ... + 215644.

It is an arithmetic number, because the mean of its divisors is an integer number (1546400625).

Almost surely, 2^17666668420 is an apocalyptic number.

17666668420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

17666668420 is an abundant number, since it is smaller than the sum of its proper divisors (19446946580).

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

17666668420 is a wasteful number, since it uses less digits than its factorization.

17666668420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324087 (or 324085 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 52.

The spelling of 17666668420 in words is "seventeen billion, six hundred sixty-six million, six hundred sixty-eight thousand, four hundred twenty".