64440540262013 has 8 divisors (see below), whose sum is σ = 64510302836280. Its totient is φ = 64370779799040.

The previous prime is 64440540261983. The next prime is 64440540262019. The reversal of 64440540262013 is 31026204504446.

It can be written as a sum of positive squares in 4 ways, for example, as 10762454461924 + 53678085800089 = 3280618^2 + 7326533^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64440540262013 - 2⁴² = 60042493750909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64440540262019) 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 in 7 ways as a sum of consecutive naturals, for example, 64937333 + ... + 65922213.

It is an arithmetic number, because the mean of its divisors is an integer number (8063787854535).

Almost surely, 2^{64440540262013} is an apocalyptic number.

It is an amenable number.

64440540262013 is a deficient number, since it is larger than the sum of its proper divisors (69762574267).

64440540262013 is an equidigital number, since it uses as much as digits as its factorization.

64440540262013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1055647.

The product of its (nonzero) digits is 552960, while the sum is 41.

Adding to 64440540262013 its reverse (31026204504446), we get a palindrome (95466744766459).

The spelling of 64440540262013 in words is "sixty-four trillion, four hundred forty billion, five hundred forty million, two hundred sixty-two thousand, thirteen".