666621126 has 24 divisors (see below), whose sum is σ = 1457132040. Its totient is φ = 220239936.

The previous prime is 666621107. The next prime is 666621127. The reversal of 666621126 is 621126666.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666621127) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 161836 + ... + 165903.

It is an arithmetic number, because the mean of its divisors is an integer number (60713835).

Almost surely, 2^666621126 is an apocalyptic number.

666621126 is an abundant number, since it is smaller than the sum of its proper divisors (790510914).

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

666621126 is a wasteful number, since it uses less digits than its factorization.

666621126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327860 (or 327857 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 666621126 is about 25819.0070684370. The cubic root of 666621126 is about 873.5605725650.

The spelling of 666621126 in words is "six hundred sixty-six million, six hundred twenty-one thousand, one hundred twenty-six".