64543434916 has 27 divisors (see below), whose sum is σ = 114951274081. Its totient is φ = 31710004064.

The previous prime is 64543434899. The next prime is 64543434937. The reversal of 64543434916 is 61943434546.

The square root of 64543434916 is 254054.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 4765140900 + 59778294016 = 69030^2 + 244496^2 .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64543434916.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 29977296 + ... + 29979448.

Almost surely, 2^64543434916 is an apocalyptic number.

64543434916 is the 254054-th square number.

It is an amenable number.

64543434916 is a deficient number, since it is larger than the sum of its proper divisors (50407839165).

64543434916 is an frugal number, since it uses more digits than its factorization.

64543434916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4428 (or 2214 counting only the distinct ones).

The product of its digits is 3732480, while the sum is 49.

Multiplying 64543434916 by its sum of digits (49), we get a square (3162628310884 = 1778378²).

The spelling of 64543434916 in words is "sixty-four billion, five hundred forty-three million, four hundred thirty-four thousand, nine hundred sixteen".