64775327549 has 4 divisors (see below), whose sum is σ = 64794111900. Its totient is φ = 64756543200.

The previous prime is 64775327521. The next prime is 64775327563. The reversal of 64775327549 is 94572357746.

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 11057994649 + 53717332900 = 105157^2 + 231770^2 .

It is a cyclic number.

It is not a de Polignac number, because 64775327549 - 2²⁴ = 64758550333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64775327509) 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, 9387002 + ... + 9393899.

It is an arithmetic number, because the mean of its divisors is an integer number (16198527975).

Almost surely, 2^64775327549 is an apocalyptic number.

It is an amenable number.

64775327549 is a deficient number, since it is larger than the sum of its proper divisors (18784351).

64775327549 is a wasteful number, since it uses less digits than its factorization.

64775327549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18784350.

The product of its digits is 44452800, while the sum is 59.

The spelling of 64775327549 in words is "sixty-four billion, seven hundred seventy-five million, three hundred twenty-seven thousand, five hundred forty-nine".