64644004597 has 4 divisors (see below), whose sum is σ = 64978947820. Its totient is φ = 64309061376.

The previous prime is 64644004577. The next prime is 64644004639. The reversal of 64644004597 is 79540044646.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 21860805316 + 42783199281 = 147854^2 + 206841^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64644004597 is a prime.

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 64644004597.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64644004567) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 167471322 + ... + 167471707.

It is an arithmetic number, because the mean of its divisors is an integer number (16244736955).

Almost surely, 2^64644004597 is an apocalyptic number.

It is an amenable number.

64644004597 is a deficient number, since it is larger than the sum of its proper divisors (334943223).

64644004597 is a wasteful number, since it uses less digits than its factorization.

64644004597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334943222.

The product of its (nonzero) digits is 2903040, while the sum is 49.

The spelling of 64644004597 in words is "sixty-four billion, six hundred forty-four million, four thousand, five hundred ninety-seven".