64549935215 has 16 divisors (see below), whose sum is σ = 80210239200. Its totient is φ = 49809927552.

The previous prime is 64549935113. The next prime is 64549935217. The reversal of 64549935215 is 51253994546.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 64549935215 - 2¹² = 64549931119 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64549935217) 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, 72845 + ... + 366614.

It is an arithmetic number, because the mean of its divisors is an integer number (5013139950).

Almost surely, 2^64549935215 is an apocalyptic number.

64549935215 is a deficient number, since it is larger than the sum of its proper divisors (15660303985).

64549935215 is a wasteful number, since it uses less digits than its factorization.

64549935215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440506.

The product of its digits is 5832000, while the sum is 53.

The spelling of 64549935215 in words is "sixty-four billion, five hundred forty-nine million, nine hundred thirty-five thousand, two hundred fifteen".