1115717661 has 6 divisors (see below), whose sum is σ = 1611592190. Its totient is φ = 743811768.

The previous prime is 1115717657. The next prime is 1115717663. The reversal of 1115717661 is 1667175111.

1115717661 is a `hidden beast` number, since 1 + 11 + 571 + 76 + 6 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 595604025 + 520113636 = 24405^2 + 22806^2 .

It is not a de Polignac number, because 1115717661 - 2² = 1115717657 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1115717663) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 61984306 + ... + 61984323.

Almost surely, 2^1115717661 is an apocalyptic number.

It is an amenable number.

1115717661 is a deficient number, since it is larger than the sum of its proper divisors (495874529).

1115717661 is a wasteful number, since it uses less digits than its factorization.

1115717661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123968635 (or 123968632 counting only the distinct ones).

The product of its digits is 8820, while the sum is 36.

The square root of 1115717661 is about 33402.3601112257. The cubic root of 1115717661 is about 1037.1735572580.

The spelling of 1115717661 in words is "one billion, one hundred fifteen million, seven hundred seventeen thousand, six hundred sixty-one".