1002643665 has 32 divisors (see below), whose sum is σ = 1650813696. Its totient is φ = 519417600.

The previous prime is 1002643657. The next prime is 1002643667. The reversal of 1002643665 is 5663462001.

It is not a de Polignac number, because 1002643665 - 2³ = 1002643657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1002643667) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 74052 + ... + 86538.

It is an arithmetic number, because the mean of its divisors is an integer number (51587928).

Almost surely, 2^1002643665 is an apocalyptic number.

1002643665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1002643665 is a deficient number, since it is larger than the sum of its proper divisors (648170031).

1002643665 is a wasteful number, since it uses less digits than its factorization.

1002643665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12649.

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 1002643665 is about 31664.5490256849. The cubic root of 1002643665 is about 1000.8804462536.

The spelling of 1002643665 in words is "one billion, two million, six hundred forty-three thousand, six hundred sixty-five".