64638483646 has 16 divisors (see below), whose sum is σ = 106760592000. Its totient is φ = 29106537880.

The previous prime is 64638483523. The next prime is 64638483647.

It is a happy number.

64638483646 is nontrivially palindromic in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64638483647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13727146 + ... + 13731853.

It is an arithmetic number, because the mean of its divisors is an integer number (6672537000).

Almost surely, 2^64638483646 is an apocalyptic number.

64638483646 is a deficient number, since it is larger than the sum of its proper divisors (42122108354).

64638483646 is a wasteful number, since it uses less digits than its factorization.

64638483646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27459119.

The product of its digits is 47775744, while the sum is 58.

The spelling of 64638483646 in words is "sixty-four billion, six hundred thirty-eight million, four hundred eighty-three thousand, six hundred forty-six".