6660400943 has 8 divisors (see below), whose sum is σ = 7613213088. Its totient is φ = 5707920384.

The previous prime is 6660400939. The next prime is 6660400993. The reversal of 6660400943 is 3490040666.

It is a happy number.

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 6660400943 - 2² = 6660400939 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6660400897 and 6660400906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6660400993) 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, 38246 + ... + 121587.

It is an arithmetic number, because the mean of its divisors is an integer number (951651636).

Almost surely, 2^6660400943 is an apocalyptic number.

6660400943 is a deficient number, since it is larger than the sum of its proper divisors (952812145).

6660400943 is a wasteful number, since it uses less digits than its factorization.

6660400943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165793.

The product of its (nonzero) digits is 93312, while the sum is 38.

The square root of 6660400943 is about 81611.2795084111. The cubic root of 6660400943 is about 1881.4822457718.

The spelling of 6660400943 in words is "six billion, six hundred sixty million, four hundred thousand, nine hundred forty-three".