64543226525 has 6 divisors (see below), whose sum is σ = 80033600922. Its totient is φ = 51634581200.

The previous prime is 64543226519. The next prime is 64543226549. The reversal of 64543226525 is 52562234546.

It can be written as a sum of positive squares in 3 ways, for example, as 8310692569 + 56232533956 = 91163^2 + 237134^2 .

It is not a de Polignac number, because 64543226525 - 2⁴ = 64543226509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1290864506 + ... + 1290864555.

It is an arithmetic number, because the mean of its divisors is an integer number (13338933487).

Almost surely, 2^64543226525 is an apocalyptic number.

It is an amenable number.

64543226525 is a deficient number, since it is larger than the sum of its proper divisors (15490374397).

64543226525 is a wasteful number, since it uses less digits than its factorization.

64543226525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2581729071 (or 2581729066 counting only the distinct ones).

The product of its digits is 1728000, while the sum is 44.

The spelling of 64543226525 in words is "sixty-four billion, five hundred forty-three million, two hundred twenty-six thousand, five hundred twenty-five".