40433278721 has 4 divisors (see below), whose sum is σ = 44109031344. Its totient is φ = 36757526100.

The previous prime is 40433278693. The next prime is 40433278723. The reversal of 40433278721 is 12787233404.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40433278721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40433278723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1837876295 + ... + 1837876316.

It is an arithmetic number, because the mean of its divisors is an integer number (11027257836).

Almost surely, 2^40433278721 is an apocalyptic number.

It is an amenable number.

40433278721 is a deficient number, since it is larger than the sum of its proper divisors (3675752623).

40433278721 is a wasteful number, since it uses less digits than its factorization.

40433278721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3675752622.

The product of its (nonzero) digits is 225792, while the sum is 41.

The spelling of 40433278721 in words is "forty billion, four hundred thirty-three million, two hundred seventy-eight thousand, seven hundred twenty-one".