65540644505 has 64 divisors (see below), whose sum is σ = 94917892608. Its totient is φ = 42508247040.

The previous prime is 65540644501. The next prime is 65540644513. The reversal of 65540644505 is 50544604556.

It is not a de Polignac number, because 65540644505 - 2² = 65540644501 is a prime.

It is not an unprimeable number, because it can be changed into a prime (65540644501) 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 in 63 ways as a sum of consecutive naturals, for example, 8449709 + ... + 8457461.

It is an arithmetic number, because the mean of its divisors is an integer number (1483092072).

Almost surely, 2^65540644505 is an apocalyptic number.

It is an amenable number.

65540644505 is a deficient number, since it is larger than the sum of its proper divisors (29377248103).

65540644505 is a wasteful number, since it uses less digits than its factorization.

65540644505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7986.

The product of its (nonzero) digits is 1440000, while the sum is 44.

The spelling of 65540644505 in words is "sixty-five billion, five hundred forty million, six hundred forty-four thousand, five hundred five".