64540655205 has 16 divisors (see below), whose sum is σ = 111208513920. Its totient is φ = 31773860928.

The previous prime is 64540655203. The next prime is 64540655213. The reversal of 64540655205 is 50255604546.

It is a happy number.

It is not a de Polignac number, because 64540655205 - 2¹ = 64540655203 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64540655203) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 165488665 + ... + 165489054.

It is an arithmetic number, because the mean of its divisors is an integer number (6950532120).

Almost surely, 2^64540655205 is an apocalyptic number.

64540655205 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

64540655205 is a deficient number, since it is larger than the sum of its proper divisors (46667858715).

64540655205 is a wasteful number, since it uses less digits than its factorization.

64540655205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330977740.

The product of its (nonzero) digits is 720000, while the sum is 42.

The spelling of 64540655205 in words is "sixty-four billion, five hundred forty million, six hundred fifty-five thousand, two hundred five".