1161615666 has 48 divisors (see below), whose sum is σ = 2412656064. Its totient is φ = 372810816.

The previous prime is 1161615617. The next prime is 1161615709. The reversal of 1161615666 is 6665161611.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 845356 + ... + 846728.

It is an arithmetic number, because the mean of its divisors is an integer number (50263668).

Almost surely, 2^1161615666 is an apocalyptic number.

1161615666 is an abundant number, since it is smaller than the sum of its proper divisors (1251040398).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1161615666 is a wasteful number, since it uses less digits than its factorization.

1161615666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1555 (or 1518 counting only the distinct ones).

The product of its digits is 38880, while the sum is 39.

The square root of 1161615666 is about 34082.4832722030. The cubic root of 1161615666 is about 1051.2051667739.

The spelling of 1161615666 in words is "one billion, one hundred sixty-one million, six hundred fifteen thousand, six hundred sixty-six".