64403081565 has 16 divisors (see below), whose sum is σ = 103661970048. Its totient is φ = 34142630336.

The previous prime is 64403081551. The next prime is 64403081581. The reversal of 64403081565 is 56518030446.

It is a cyclic number.

It is not a de Polignac number, because 64403081565 - 2¹⁵ = 64403048797 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12852402 + ... + 12857411.

It is an arithmetic number, because the mean of its divisors is an integer number (6478873128).

Almost surely, 2^64403081565 is an apocalyptic number.

It is an amenable number.

64403081565 is a deficient number, since it is larger than the sum of its proper divisors (39258888483).

64403081565 is a wasteful number, since it uses less digits than its factorization.

64403081565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25709988.

The product of its (nonzero) digits is 345600, while the sum is 42.

The spelling of 64403081565 in words is "sixty-four billion, four hundred three million, eighty-one thousand, five hundred sixty-five".