666022438 has 4 divisors (see below), whose sum is σ = 999033660. Its totient is φ = 333011218.

The previous prime is 666022429. The next prime is 666022451. The reversal of 666022438 is 834220666.

666022438 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 666022397 and 666022406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166505608 + ... + 166505611.

It is an arithmetic number, because the mean of its divisors is an integer number (249758415).

Almost surely, 2^666022438 is an apocalyptic number.

666022438 is a deficient number, since it is larger than the sum of its proper divisors (333011222).

666022438 is a wasteful number, since it uses less digits than its factorization.

666022438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333011221.

The product of its (nonzero) digits is 82944, while the sum is 37.

The square root of 666022438 is about 25807.4105248861. The cubic root of 666022438 is about 873.2989812579.

The spelling of 666022438 in words is "six hundred sixty-six million, twenty-two thousand, four hundred thirty-eight".