440561663 has 2 divisors, whose sum is σ = 440561664. Its totient is φ = 440561662.

The previous prime is 440561657. The next prime is 440561689. The reversal of 440561663 is 366165044.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 440561663 - 2¹⁶ = 440496127 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (440561633) 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, 220280831 + 220280832.

It is an arithmetic number, because the mean of its divisors is an integer number (220280832).

Almost surely, 2^440561663 is an apocalyptic number.

440561663 is a deficient number, since it is larger than the sum of its proper divisors (1).

440561663 is an equidigital number, since it uses as much as digits as its factorization.

440561663 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 35.

The square root of 440561663 is about 20989.5608100789. The cubic root of 440561663 is about 760.9139875263.

The spelling of 440561663 in words is "four hundred forty million, five hundred sixty-one thousand, six hundred sixty-three".