8001665064 has 24 divisors (see below), whose sum is σ = 21671176410. Its totient is φ = 2667221664.

The previous prime is 8001665053. The next prime is 8001665081. The reversal of 8001665064 is 4605661008.

It can be written as a sum of positive squares in only one way, i.e., 4441156164 + 3560508900 = 66642^2 + 59670^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 55567047 + ... + 55567190.

Almost surely, 2^8001665064 is an apocalyptic number.

It is an amenable number.

8001665064 is an abundant number, since it is smaller than the sum of its proper divisors (13669511346).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8001665064 is a wasteful number, since it uses less digits than its factorization.

8001665064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111134249 (or 111134242 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 8001665064 is about 89452.0266064442. The cubic root of 8001665064 is about 2000.1387457079.

The spelling of 8001665064 in words is "eight billion, one million, six hundred sixty-five thousand, sixty-four".