1165623020 has 48 divisors (see below), whose sum is σ = 2728222560. Its totient is φ = 415724544.

The previous prime is 1165622993. The next prime is 1165623023. The reversal of 1165623020 is 203265611.

It is not an unprimeable number, because it can be changed into a prime (1165623023) 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, 83759 + ... + 96678.

It is an arithmetic number, because the mean of its divisors is an integer number (56837970).

Almost surely, 2^1165623020 is an apocalyptic number.

1165623020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1165623020 is an abundant number, since it is smaller than the sum of its proper divisors (1562599540).

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

1165623020 is a wasteful number, since it uses less digits than its factorization.

1165623020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180482 (or 180480 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 1165623020 is about 34141.2217121766. The cubic root of 1165623020 is about 1052.4125989301.

Adding to 1165623020 its reverse (203265611), we get a palindrome (1368888631).

The spelling of 1165623020 in words is "one billion, one hundred sixty-five million, six hundred twenty-three thousand, twenty".