40320420233981 has 2 divisors, whose sum is σ = 40320420233982. Its totient is φ = 40320420233980.

The previous prime is 40320420233971. The next prime is 40320420234011. The reversal of 40320420233981 is 18933202402304.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34045941312100 + 6274478921881 = 5834890^2 + 2504891^2 .

It is a cyclic number.

It is not a de Polignac number, because 40320420233981 - 2⁶ = 40320420233917 is a prime.

It is a super-2 number, since 2×40320420233981² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40320420233921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20160210116990 + 20160210116991.

It is an arithmetic number, because the mean of its divisors is an integer number (20160210116991).

Almost surely, 2^{40320420233981} is an apocalyptic number.

It is an amenable number.

40320420233981 is a deficient number, since it is larger than the sum of its proper divisors (1).

40320420233981 is an equidigital number, since it uses as much as digits as its factorization.

40320420233981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 248832, while the sum is 41.

The spelling of 40320420233981 in words is "forty trillion, three hundred twenty billion, four hundred twenty million, two hundred thirty-three thousand, nine hundred eighty-one".