43721142664 has 16 divisors (see below), whose sum is σ = 82451001420. Its totient is φ = 21734208960.

The previous prime is 43721142643. The next prime is 43721142667. The reversal of 43721142664 is 46624112734.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 33473629764 + 10247512900 = 182958^2 + 101230^2 .

It is not an unprimeable number, because it can be changed into a prime (43721142667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15793827 + ... + 15796594.

Almost surely, 2^43721142664 is an apocalyptic number.

It is an amenable number.

43721142664 is a deficient number, since it is larger than the sum of its proper divisors (38729858756).

43721142664 is a wasteful number, since it uses less digits than its factorization.

43721142664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31590600 (or 31590596 counting only the distinct ones).

The product of its digits is 193536, while the sum is 40.

The spelling of 43721142664 in words is "forty-three billion, seven hundred twenty-one million, one hundred forty-two thousand, six hundred sixty-four".