64539919629 has 6 divisors (see below), whose sum is σ = 93224328366. Its totient is φ = 43026613080.

The previous prime is 64539919547. The next prime is 64539919669. The reversal of 64539919629 is 92691993546.

64539919629 is a `hidden beast` number, since 6 + 4 + 539 + 9 + 1 + 96 + 2 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 40442014404 + 24097905225 = 201102^2 + 155235^2 .

It is not a de Polignac number, because 64539919629 - 2⁹ = 64539919117 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64539919669) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3585551082 + ... + 3585551099.

It is an arithmetic number, because the mean of its divisors is an integer number (15537388061).

Almost surely, 2^64539919629 is an apocalyptic number.

It is an amenable number.

64539919629 is a deficient number, since it is larger than the sum of its proper divisors (28684408737).

64539919629 is a wasteful number, since it uses less digits than its factorization.

64539919629 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7171102187 (or 7171102184 counting only the distinct ones).

The product of its digits is 28343520, while the sum is 63.

The spelling of 64539919629 in words is "sixty-four billion, five hundred thirty-nine million, nine hundred nineteen thousand, six hundred twenty-nine".