1001555065 has 16 divisors (see below), whose sum is σ = 1382664960. Its totient is φ = 682228800.

The previous prime is 1001555063. The next prime is 1001555069. The reversal of 1001555065 is 5605551001.

It is not a de Polignac number, because 1001555065 - 2¹ = 1001555063 is a prime.

It is a super-2 number, since 2×1001555065² = 2006225096454308450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1001555063) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89470 + ... + 100039.

It is an arithmetic number, because the mean of its divisors is an integer number (86416560).

Almost surely, 2^1001555065 is an apocalyptic number.

It is an amenable number.

1001555065 is a deficient number, since it is larger than the sum of its proper divisors (381109895).

1001555065 is a wasteful number, since it uses less digits than its factorization.

1001555065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189672.

The product of its (nonzero) digits is 3750, while the sum is 28.

The square root of 1001555065 is about 31647.3547867748. The cubic root of 1001555065 is about 1000.5180865400.

The spelling of 1001555065 in words is "one billion, one million, five hundred fifty-five thousand, sixty-five".