64839883642 has 4 divisors (see below), whose sum is σ = 97259825466. Its totient is φ = 32419941820.

The previous prime is 64839883631. The next prime is 64839883649. The reversal of 64839883642 is 24638893846.

64839883642 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 61285458481 + 3554425161 = 247559^2 + 59619^2 .

It is not an unprimeable number, because it can be changed into a prime (64839883649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16209970909 + ... + 16209970912.

Almost surely, 2^64839883642 is an apocalyptic number.

64839883642 is a deficient number, since it is larger than the sum of its proper divisors (32419941824).

64839883642 is a wasteful number, since it uses less digits than its factorization.

64839883642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32419941823.

The product of its digits is 47775744, while the sum is 61.

The spelling of 64839883642 in words is "sixty-four billion, eight hundred thirty-nine million, eight hundred eighty-three thousand, six hundred forty-two".