666961343 has 8 divisors (see below), whose sum is σ = 692146080. Its totient is φ = 641922400.

The previous prime is 666961331. The next prime is 666961367. The reversal of 666961343 is 343169666.

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 666961343 - 2⁴ = 666961327 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 666961294 and 666961303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666961303) 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, 27083 + ... + 45468.

It is an arithmetic number, because the mean of its divisors is an integer number (86518260).

Almost surely, 2^666961343 is an apocalyptic number.

666961343 is a deficient number, since it is larger than the sum of its proper divisors (25184737).

666961343 is a wasteful number, since it uses less digits than its factorization.

666961343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72897.

The product of its digits is 419904, while the sum is 44.

The square root of 666961343 is about 25825.5947269371. The cubic root of 666961343 is about 873.7091575209.

The spelling of 666961343 in words is "six hundred sixty-six million, nine hundred sixty-one thousand, three hundred forty-three".