1152605661 has 16 divisors (see below), whose sum is σ = 1630108800. Its totient is φ = 721914368.

The previous prime is 1152605659. The next prime is 1152605677. The reversal of 1152605661 is 1665062511.

It is a cyclic number.

It is not a de Polignac number, because 1152605661 - 2¹ = 1152605659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1152605561) 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, 9160 + ... + 48878.

It is an arithmetic number, because the mean of its divisors is an integer number (101881800).

Almost surely, 2^1152605661 is an apocalyptic number.

It is an amenable number.

1152605661 is a deficient number, since it is larger than the sum of its proper divisors (477503139).

1152605661 is a wasteful number, since it uses less digits than its factorization.

1152605661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40308.

The product of its (nonzero) digits is 10800, while the sum is 33.

The square root of 1152605661 is about 33950.0465537236. The cubic root of 1152605661 is about 1048.4802385592.

The spelling of 1152605661 in words is "one billion, one hundred fifty-two million, six hundred five thousand, six hundred sixty-one".