64772336285 has 4 divisors (see below), whose sum is σ = 77726803548. Its totient is φ = 51817869024.

The previous prime is 64772336263. The next prime is 64772336287. The reversal of 64772336285 is 58263327746.

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 13350878116 + 51421458169 = 115546^2 + 226763^2 .

It is a cyclic number.

It is not a de Polignac number, because 64772336285 - 2¹⁰ = 64772335261 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 (64772336287) 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, 6477233624 + ... + 6477233633.

It is an arithmetic number, because the mean of its divisors is an integer number (19431700887).

Almost surely, 2^64772336285 is an apocalyptic number.

It is an amenable number.

64772336285 is a deficient number, since it is larger than the sum of its proper divisors (12954467263).

64772336285 is a wasteful number, since it uses less digits than its factorization.

64772336285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12954467262.

The product of its digits is 10160640, while the sum is 53.

The spelling of 64772336285 in words is "sixty-four billion, seven hundred seventy-two million, three hundred thirty-six thousand, two hundred eighty-five".