666645351 has 8 divisors (see below), whose sum is σ = 889152624. Its totient is φ = 444284160.

The previous prime is 666645347. The next prime is 666645379. The reversal of 666645351 is 153546666.

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

It is not a de Polignac number, because 666645351 - 2² = 666645347 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666645451) 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, 25386 + ... + 44471.

It is an arithmetic number, because the mean of its divisors is an integer number (111144078).

Almost surely, 2^666645351 is an apocalyptic number.

666645351 is a deficient number, since it is larger than the sum of its proper divisors (222507273).

666645351 is a wasteful number, since it uses less digits than its factorization.

666645351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73041.

The product of its digits is 388800, while the sum is 42.

The square root of 666645351 is about 25819.4761953065. The cubic root of 666645351 is about 873.5711541621.

The spelling of 666645351 in words is "six hundred sixty-six million, six hundred forty-five thousand, three hundred fifty-one".