2161117664 has 12 divisors (see below), whose sum is σ = 4254700464. Its totient is φ = 1080558816.

The previous prime is 2161117661. The next prime is 2161117681. The reversal of 2161117664 is 4667111612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161117661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33767432 + ... + 33767495.

It is an arithmetic number, because the mean of its divisors is an integer number (354558372).

Almost surely, 2^2161117664 is an apocalyptic number.

It is an amenable number.

2161117664 is a deficient number, since it is larger than the sum of its proper divisors (2093582800).

2161117664 is an equidigital number, since it uses as much as digits as its factorization.

2161117664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67534937 (or 67534929 counting only the distinct ones).

The product of its digits is 12096, while the sum is 35.

The square root of 2161117664 is about 46487.8227496191. The cubic root of 2161117664 is about 1292.8837324353.

The spelling of 2161117664 in words is "two billion, one hundred sixty-one million, one hundred seventeen thousand, six hundred sixty-four".