40645054591 has 2 divisors, whose sum is σ = 40645054592. Its totient is φ = 40645054590.

The previous prime is 40645054579. The next prime is 40645054621. The reversal of 40645054591 is 19545054604.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40645054591 - 2⁵ = 40645054559 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40645054501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20322527295 + 20322527296.

It is an arithmetic number, because the mean of its divisors is an integer number (20322527296).

Almost surely, 2^40645054591 is an apocalyptic number.

40645054591 is a deficient number, since it is larger than the sum of its proper divisors (1).

40645054591 is an equidigital number, since it uses as much as digits as its factorization.

40645054591 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432000, while the sum is 43.

It can be divided in two parts, 406450 and 54591, that added together give a square (461041 = 679²).

The spelling of 40645054591 in words is "forty billion, six hundred forty-five million, fifty-four thousand, five hundred ninety-one".