1161661770 has 64 divisors (see below), whose sum is σ = 3169837440. Its totient is φ = 302569344.

The previous prime is 1161661769. The next prime is 1161661783. The reversal of 1161661770 is 771661611.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 38419 + ... + 61638.

It is an arithmetic number, because the mean of its divisors is an integer number (49528710).

Almost surely, 2^1161661770 is an apocalyptic number.

1161661770 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1161661770 is an abundant number, since it is smaller than the sum of its proper divisors (2008175670).

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

1161661770 is a wasteful number, since it uses less digits than its factorization.

1161661770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100116 (or 100110 counting only the distinct ones).

The product of its (nonzero) digits is 10584, while the sum is 36.

The square root of 1161661770 is about 34083.1596246592. The cubic root of 1161661770 is about 1051.2190738757.

The spelling of 1161661770 in words is "one billion, one hundred sixty-one million, six hundred sixty-one thousand, seven hundred seventy".