2161011640 has 32 divisors (see below), whose sum is σ = 4993692480. Its totient is φ = 841041792.

The previous prime is 2161011617. The next prime is 2161011653. The reversal of 2161011640 is 461101612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 728592 + ... + 731551.

It is an arithmetic number, because the mean of its divisors is an integer number (156052890).

Almost surely, 2^2161011640 is an apocalyptic number.

2161011640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2161011640 is an abundant number, since it is smaller than the sum of its proper divisors (2832680840).

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

2161011640 is a wasteful number, since it uses less digits than its factorization.

2161011640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1460191 (or 1460187 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 2161011640 is about 46486.6823939932. The cubic root of 2161011640 is about 1292.8625892172.

The spelling of 2161011640 in words is "two billion, one hundred sixty-one million, eleven thousand, six hundred forty".