1156565601 has 16 divisors (see below), whose sum is σ = 1715041920. Its totient is φ = 770318640.

The previous prime is 1156565569. The next prime is 1156565611. The reversal of 1156565601 is 1065656511.

1156565601 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1156565601 - 2⁵ = 1156565569 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1156565611) 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, 9916 + ... + 49106.

It is an arithmetic number, because the mean of its divisors is an integer number (107190120).

Almost surely, 2^1156565601 is an apocalyptic number.

It is an amenable number.

1156565601 is a deficient number, since it is larger than the sum of its proper divisors (558476319).

1156565601 is a wasteful number, since it uses less digits than its factorization.

1156565601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40293 (or 40287 counting only the distinct ones).

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

The square root of 1156565601 is about 34008.3166446092. The cubic root of 1156565601 is about 1049.6796002015.

The spelling of 1156565601 in words is "one billion, one hundred fifty-six million, five hundred sixty-five thousand, six hundred one".