1165542620 has 48 divisors (see below), whose sum is σ = 2683806048. Its totient is φ = 421666560.

The previous prime is 1165542617. The next prime is 1165542643. The reversal of 1165542620 is 262455611.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29894 + ... + 56786.

It is an arithmetic number, because the mean of its divisors is an integer number (55912626).

Almost surely, 2^1165542620 is an apocalyptic number.

1165542620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1165542620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1341903024).

1165542620 is an abundant number, since it is smaller than the sum of its proper divisors (1518263428).

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

1165542620 is a wasteful number, since it uses less digits than its factorization.

1165542620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27110 (or 27108 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 1165542620 is about 34140.0442296140. The cubic root of 1165542620 is about 1052.3884013073.

The spelling of 1165542620 in words is "one billion, one hundred sixty-five million, five hundred forty-two thousand, six hundred twenty".