666276421 has 8 divisors (see below), whose sum is σ = 689626080. Its totient is φ = 642951792.

The previous prime is 666276407. The next prime is 666276431. The reversal of 666276421 is 124672666.

666276421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 666276421 - 2⁷ = 666276293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666276431) 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, 59926 + ... + 70168.

It is an arithmetic number, because the mean of its divisors is an integer number (86203260).

Almost surely, 2^666276421 is an apocalyptic number.

It is an amenable number.

666276421 is a deficient number, since it is larger than the sum of its proper divisors (23349659).

666276421 is a wasteful number, since it uses less digits than its factorization.

666276421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12515.

The product of its digits is 145152, while the sum is 40.

The square root of 666276421 is about 25812.3307936343. The cubic root of 666276421 is about 873.4099759703.

The spelling of 666276421 in words is "six hundred sixty-six million, two hundred seventy-six thousand, four hundred twenty-one".