64643433234 has 16 divisors (see below), whose sum is σ = 129763943040. Its totient is φ = 21468298320.

The previous prime is 64643433199. The next prime is 64643433263. The reversal of 64643433234 is 43233434646.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19876429 + ... + 19879680.

It is an arithmetic number, because the mean of its divisors is an integer number (8110246440).

Almost surely, 2^64643433234 is an apocalyptic number.

64643433234 is an abundant number, since it is smaller than the sum of its proper divisors (65120509806).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64643433234 is a wasteful number, since it uses less digits than its factorization.

64643433234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39756385.

The product of its digits is 1492992, while the sum is 42.

The spelling of 64643433234 in words is "sixty-four billion, six hundred forty-three million, four hundred thirty-three thousand, two hundred thirty-four".