1188661505 has 16 divisors (see below), whose sum is σ = 1575967104. Its totient is φ = 856078080.

The previous prime is 1188661501. The next prime is 1188661511. The reversal of 1188661505 is 5051668811.

It is not a de Polignac number, because 1188661505 - 2² = 1188661501 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1188661501) 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, 302051 + ... + 305960.

It is an arithmetic number, because the mean of its divisors is an integer number (98497944).

Almost surely, 2^1188661505 is an apocalyptic number.

It is an amenable number.

1188661505 is a deficient number, since it is larger than the sum of its proper divisors (387305599).

1188661505 is a wasteful number, since it uses less digits than its factorization.

1188661505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 608056.

The product of its (nonzero) digits is 57600, while the sum is 41.

The square root of 1188661505 is about 34476.9706470856. The cubic root of 1188661505 is about 1059.3010418228.

The spelling of 1188661505 in words is "one billion, one hundred eighty-eight million, six hundred sixty-one thousand, five hundred five".