64440540261983 has 2 divisors, whose sum is σ = 64440540261984. Its totient is φ = 64440540261982.

The previous prime is 64440540261973. The next prime is 64440540262019. The reversal of 64440540261983 is 38916204504446.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64440540261983 - 2¹⁶ = 64440540196447 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64440540261943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32220270130991 + 32220270130992.

It is an arithmetic number, because the mean of its divisors is an integer number (32220270130992).

Almost surely, 2^{64440540261983} is an apocalyptic number.

64440540261983 is a deficient number, since it is larger than the sum of its proper divisors (1).

64440540261983 is an equidigital number, since it uses as much as digits as its factorization.

64440540261983 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19906560, while the sum is 56.

The spelling of 64440540261983 in words is "sixty-four trillion, four hundred forty billion, five hundred forty million, two hundred sixty-one thousand, nine hundred eighty-three".