64763451565 has 4 divisors (see below), whose sum is σ = 77716141884. Its totient is φ = 51810761248.

The previous prime is 64763451563. The next prime is 64763451581. The reversal of 64763451565 is 56515436746.

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 51236133316 + 13527318249 = 226354^2 + 116307^2 .

It is a cyclic number.

It is not a de Polignac number, because 64763451565 - 2¹ = 64763451563 is a prime.

It is a super-2 number, since 2×64763451565² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64763451563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6476345152 + ... + 6476345161.

It is an arithmetic number, because the mean of its divisors is an integer number (19429035471).

Almost surely, 2^64763451565 is an apocalyptic number.

It is an amenable number.

64763451565 is a deficient number, since it is larger than the sum of its proper divisors (12952690319).

64763451565 is a wasteful number, since it uses less digits than its factorization.

64763451565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12952690318.

The product of its digits is 9072000, while the sum is 52.

The spelling of 64763451565 in words is "sixty-four billion, seven hundred sixty-three million, four hundred fifty-one thousand, five hundred sixty-five".