666654441 has 8 divisors (see below), whose sum is σ = 892561824. Its totient is φ = 442591680.

The previous prime is 666654431. The next prime is 666654451. The reversal of 666654441 is 144456666.

It is an interprime number because it is at equal distance from previous prime (666654431) and next prime (666654451).

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

It is not a de Polignac number, because 666654441 - 2¹³ = 666646249 is a prime.

It is a Curzon number.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 666654393 and 666654402.

It is not an unprimeable number, because it can be changed into a prime (666654431) 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, 460311 + ... + 461756.

It is an arithmetic number, because the mean of its divisors is an integer number (111570228).

Almost surely, 2^666654441 is an apocalyptic number.

It is an amenable number.

666654441 is a deficient number, since it is larger than the sum of its proper divisors (225907383).

666654441 is a wasteful number, since it uses less digits than its factorization.

666654441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 922311.

The product of its digits is 414720, while the sum is 42.

The square root of 666654441 is about 25819.6522246137. The cubic root of 666654441 is about 873.5751246519.

The spelling of 666654441 in words is "six hundred sixty-six million, six hundred fifty-four thousand, four hundred forty-one".