1165015566 has 96 divisors (see below), whose sum is σ = 2975132160. Its totient is φ = 324820800.

The previous prime is 1165015549. The next prime is 1165015583. The reversal of 1165015566 is 6655105611.

It is an interprime number because it is at equal distance from previous prime (1165015549) and next prime (1165015583).

It is a super-2 number, since 2×1165015566² = 2714522538044600712, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1165015566.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1129471 + ... + 1130501.

It is an arithmetic number, because the mean of its divisors is an integer number (30990960).

Almost surely, 2^1165015566 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1165015566, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1487566080).

1165015566 is an abundant number, since it is smaller than the sum of its proper divisors (1810116594).

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

1165015566 is a wasteful number, since it uses less digits than its factorization.

1165015566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1502 (or 1499 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The square root of 1165015566 is about 34132.3243568322. The cubic root of 1165015566 is about 1052.2297486953.

The spelling of 1165015566 in words is "one billion, one hundred sixty-five million, fifteen thousand, five hundred sixty-six".