1165603621 has 48 divisors (see below), whose sum is σ = 1548120000. Its totient is φ = 867428352.

The previous prime is 1165603597. The next prime is 1165603643. The reversal of 1165603621 is 1263065611.

It is not a de Polignac number, because 1165603621 - 2¹¹ = 1165601573 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1165603651) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2335630 + ... + 2336128.

It is an arithmetic number, because the mean of its divisors is an integer number (32252500).

Almost surely, 2^1165603621 is an apocalyptic number.

It is an amenable number.

1165603621 is a deficient number, since it is larger than the sum of its proper divisors (382516379).

1165603621 is a wasteful number, since it uses less digits than its factorization.

1165603621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 738 (or 731 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 1165603621 is about 34140.9376116123. The cubic root of 1165603621 is about 1052.4067606030.

The spelling of 1165603621 in words is "one billion, one hundred sixty-five million, six hundred three thousand, six hundred twenty-one".