1156661559 has 64 divisors (see below), whose sum is σ = 1843845120. Its totient is φ = 714954240.

The previous prime is 1156661557. The next prime is 1156661563. The reversal of 1156661559 is 9551666511.

It is not a de Polignac number, because 1156661559 - 2¹ = 1156661557 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1156661557) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3719014 + ... + 3719324.

It is an arithmetic number, because the mean of its divisors is an integer number (28810080).

Almost surely, 2^1156661559 is an apocalyptic number.

1156661559 is a deficient number, since it is larger than the sum of its proper divisors (687183561).

1156661559 is a wasteful number, since it uses less digits than its factorization.

1156661559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 509 (or 503 counting only the distinct ones).

The product of its digits is 243000, while the sum is 45.

The square root of 1156661559 is about 34009.7274173140. The cubic root of 1156661559 is about 1049.7086293574.

The spelling of 1156661559 in words is "one billion, one hundred fifty-six million, six hundred sixty-one thousand, five hundred fifty-nine".