64322787985 has 4 divisors (see below), whose sum is σ = 77187345588. Its totient is φ = 51458230384.

The previous prime is 64322787983. The next prime is 64322788003. The reversal of 64322787985 is 58978722346.

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 20467308096 + 43855479889 = 143064^2 + 209417^2 .

It is a cyclic number.

It is not a de Polignac number, because 64322787985 - 2¹ = 64322787983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64322787983) 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, 6432278794 + ... + 6432278803.

It is an arithmetic number, because the mean of its divisors is an integer number (19296836397).

Almost surely, 2^64322787985 is an apocalyptic number.

It is an amenable number.

64322787985 is a deficient number, since it is larger than the sum of its proper divisors (12864557603).

64322787985 is a wasteful number, since it uses less digits than its factorization.

64322787985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12864557602.

The product of its digits is 40642560, while the sum is 61.

The spelling of 64322787985 in words is "sixty-four billion, three hundred twenty-two million, seven hundred eighty-seven thousand, nine hundred eighty-five".