40645054621 has 2 divisors, whose sum is σ = 40645054622. Its totient is φ = 40645054620.

The previous prime is 40645054591. The next prime is 40645054627. The reversal of 40645054621 is 12645054604.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39525416100 + 1119638521 = 198810^2 + 33461^2 .

It is a cyclic number.

It is not a de Polignac number, because 40645054621 - 2⁷ = 40645054493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40645054627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20322527310 + 20322527311.

It is an arithmetic number, because the mean of its divisors is an integer number (20322527311).

Almost surely, 2^40645054621 is an apocalyptic number.

It is an amenable number.

40645054621 is a deficient number, since it is larger than the sum of its proper divisors (1).

40645054621 is an equidigital number, since it uses as much as digits as its factorization.

40645054621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 115200, while the sum is 37.

The spelling of 40645054621 in words is "forty billion, six hundred forty-five million, fifty-four thousand, six hundred twenty-one".