1165866620 has 12 divisors (see below), whose sum is σ = 2448319944. Its totient is φ = 466346640.

The previous prime is 1165866601. The next prime is 1165866623. The reversal of 1165866620 is 266685611.

It is a happy number.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1165866623) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 29146646 + ... + 29146685.

It is an arithmetic number, because the mean of its divisors is an integer number (204026662).

Almost surely, 2^1165866620 is an apocalyptic number.

1165866620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1165866620 is an abundant number, since it is smaller than the sum of its proper divisors (1282453324).

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

1165866620 is a wasteful number, since it uses less digits than its factorization.

1165866620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58293340 (or 58293338 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 41.

The square root of 1165866620 is about 34144.7890607044. The cubic root of 1165866620 is about 1052.4859073233.

The spelling of 1165866620 in words is "one billion, one hundred sixty-five million, eight hundred sixty-six thousand, six hundred twenty".