40807544621 has 2 divisors, whose sum is σ = 40807544622. Its totient is φ = 40807544620.

The previous prime is 40807544599. The next prime is 40807544707. The reversal of 40807544621 is 12644570804.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36687188521 + 4120356100 = 191539^2 + 64190^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40807544621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40807544321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20403772310 + 20403772311.

It is an arithmetic number, because the mean of its divisors is an integer number (20403772311).

Almost surely, 2^40807544621 is an apocalyptic number.

It is an amenable number.

40807544621 is a deficient number, since it is larger than the sum of its proper divisors (1).

40807544621 is an equidigital number, since it uses as much as digits as its factorization.

40807544621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 215040, while the sum is 41.

The spelling of 40807544621 in words is "forty billion, eight hundred seven million, five hundred forty-four thousand, six hundred twenty-one".