666126438 has 16 divisors (see below), whose sum is σ = 1332575040. Its totient is φ = 221988456.

The previous prime is 666126413. The next prime is 666126449. The reversal of 666126438 is 834621666.

It is a self number, because there is not a number n which added to its sum of digits gives 666126438.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19773 + ... + 41511.

It is an arithmetic number, because the mean of its divisors is an integer number (83285940).

Almost surely, 2^666126438 is an apocalyptic number.

666126438 is an abundant number, since it is smaller than the sum of its proper divisors (666448602).

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

666126438 is a wasteful number, since it uses less digits than its factorization.

666126438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26851.

The product of its digits is 248832, while the sum is 42.

The square root of 666126438 is about 25809.4253713638. The cubic root of 666126438 is about 873.3444343648.

The spelling of 666126438 in words is "six hundred sixty-six million, one hundred twenty-six thousand, four hundred thirty-eight".