40443623257 has 2 divisors, whose sum is σ = 40443623258. Its totient is φ = 40443623256.

The previous prime is 40443623183. The next prime is 40443623261. The reversal of 40443623257 is 75232634404.

40443623257 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39326459481 + 1117163776 = 198309^2 + 33424^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40443623257 is a prime.

It is not a weakly prime, because it can be changed into another prime (40443603257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20221811628 + 20221811629.

It is an arithmetic number, because the mean of its divisors is an integer number (20221811629).

Almost surely, 2^40443623257 is an apocalyptic number.

It is an amenable number.

40443623257 is a deficient number, since it is larger than the sum of its proper divisors (1).

40443623257 is an equidigital number, since it uses as much as digits as its factorization.

40443623257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 483840, while the sum is 40.

The spelling of 40443623257 in words is "forty billion, four hundred forty-three million, six hundred twenty-three thousand, two hundred fifty-seven".