8021002665 has 64 divisors (see below), whose sum is σ = 14584872960. Its totient is φ = 3731546880.

The previous prime is 8021002663. The next prime is 8021002687. The reversal of 8021002665 is 5662001208.

It is not a de Polignac number, because 8021002665 - 2¹ = 8021002663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8021002663) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1594344 + ... + 1599366.

It is an arithmetic number, because the mean of its divisors is an integer number (227888640).

Almost surely, 2^8021002665 is an apocalyptic number.

It is an amenable number.

8021002665 is a deficient number, since it is larger than the sum of its proper divisors (6563870295).

8021002665 is a wasteful number, since it uses less digits than its factorization.

8021002665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5494.

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 8021002665 is about 89560.0506085163. The cubic root of 8021002665 is about 2001.7486926747.

The spelling of 8021002665 in words is "eight billion, twenty-one million, two thousand, six hundred sixty-five".