64442361025 has 27 divisors (see below), whose sum is σ = 92967635721. Its totient is φ = 44182955040.

The previous prime is 64442361019. The next prime is 64442361029. The reversal of 64442361025 is 52016324446.

The square root of 64442361025 is 253855.

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

It can be written as a sum of positive squares in 4 ways, for example, as 599221441 + 63843139584 = 24479^2 + 252672^2 .

It is not a de Polignac number, because 64442361025 - 2⁵ = 64442360993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64442361029) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 8881299 + ... + 8888551.

Almost surely, 2^64442361025 is an apocalyptic number.

64442361025 is the 253855-th square number.

64442361025 is the 126928-th centered octagonal number.

It is an amenable number.

64442361025 is a deficient number, since it is larger than the sum of its proper divisors (28525274696).

64442361025 is an frugal number, since it uses more digits than its factorization.

64442361025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14530 (or 7265 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 37.

The spelling of 64442361025 in words is "sixty-four billion, four hundred forty-two million, three hundred sixty-one thousand, twenty-five".