43851372666 has 16 divisors (see below), whose sum is σ = 87912064800. Its totient is φ = 14582237648.

The previous prime is 43851372661. The next prime is 43851372703. The reversal of 43851372666 is 66627315834.

It is not an unprimeable number, because it can be changed into a prime (43851372661) 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, 8718921 + ... + 8723948.

It is an arithmetic number, because the mean of its divisors is an integer number (5494504050).

Almost surely, 2^43851372666 is an apocalyptic number.

43851372666 is an abundant number, since it is smaller than the sum of its proper divisors (44060692134).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

43851372666 is a wasteful number, since it uses less digits than its factorization.

43851372666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17443293.

The product of its digits is 4354560, while the sum is 51.

The spelling of 43851372666 in words is "forty-three billion, eight hundred fifty-one million, three hundred seventy-two thousand, six hundred sixty-six".