1165661994 has 32 divisors (see below), whose sum is σ = 2665382400. Its totient is φ = 332919792.

The previous prime is 1165661977. The next prime is 1165662067. The reversal of 1165661994 is 4991665611.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 211437 + ... + 216879.

It is an arithmetic number, because the mean of its divisors is an integer number (83293200).

Almost surely, 2^1165661994 is an apocalyptic number.

1165661994 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1165661994 is an abundant number, since it is smaller than the sum of its proper divisors (1499720406).

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

1165661994 is a wasteful number, since it uses less digits than its factorization.

1165661994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10554.

The product of its digits is 349920, while the sum is 48.

The square root of 1165661994 is about 34141.7924836995. The cubic root of 1165661994 is about 1052.4243283574.

The spelling of 1165661994 in words is "one billion, one hundred sixty-five million, six hundred sixty-one thousand, nine hundred ninety-four".