40326880721 has 2 divisors, whose sum is σ = 40326880722. Its totient is φ = 40326880720.

The previous prime is 40326880709. The next prime is 40326880793. The reversal of 40326880721 is 12708862304.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29804224321 + 10522656400 = 172639^2 + 102580^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40326880721 is a prime.

It is a super-2 number, since 2×40326880721² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40326880621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20163440360 + 20163440361.

It is an arithmetic number, because the mean of its divisors is an integer number (20163440361).

Almost surely, 2^40326880721 is an apocalyptic number.

It is an amenable number.

40326880721 is a deficient number, since it is larger than the sum of its proper divisors (1).

40326880721 is an equidigital number, since it uses as much as digits as its factorization.

40326880721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 129024, while the sum is 41.

The spelling of 40326880721 in words is "forty billion, three hundred twenty-six million, eight hundred eighty thousand, seven hundred twenty-one".