2161159704 has 240 divisors, whose sum is σ = 6818925960. Its totient is φ = 638668800.

The previous prime is 2161159673. The next prime is 2161159711. The reversal of 2161159704 is 4079511612.

2161159704 is a `hidden beast` number, since 2 + 1 + 61 + 1 + 597 + 0 + 4 = 666.

It is a super-2 number, since 2×2161159704² = 9341222532386735232, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 3371224 + ... + 3371864.

Almost surely, 2^2161159704 is an apocalyptic number.

2161159704 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2161159704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3409462980).

2161159704 is an abundant number, since it is smaller than the sum of its proper divisors (4657766256).

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

2161159704 is a wasteful number, since it uses less digits than its factorization.

2161159704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 724 (or 700 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 36.

The square root of 2161159704 is about 46488.2749088413. The cubic root of 2161159704 is about 1292.8921158258.

The spelling of 2161159704 in words is "two billion, one hundred sixty-one million, one hundred fifty-nine thousand, seven hundred four".