40382545921 has 2 divisors, whose sum is σ = 40382545922. Its totient is φ = 40382545920.

The previous prime is 40382545913. The next prime is 40382545961. The reversal of 40382545921 is 12954528304.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21893345296 + 18489200625 = 147964^2 + 135975^2 .

It is a cyclic number.

It is not a de Polignac number, because 40382545921 - 2³ = 40382545913 is a prime.

It is not a weakly prime, because it can be changed into another prime (40382545961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20191272960 + 20191272961.

It is an arithmetic number, because the mean of its divisors is an integer number (20191272961).

Almost surely, 2^40382545921 is an apocalyptic number.

It is an amenable number.

40382545921 is a deficient number, since it is larger than the sum of its proper divisors (1).

40382545921 is an equidigital number, since it uses as much as digits as its factorization.

40382545921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 345600, while the sum is 43.

The spelling of 40382545921 in words is "forty billion, three hundred eighty-two million, five hundred forty-five thousand, nine hundred twenty-one".