2161651167 has 48 divisors (see below), whose sum is σ = 3605696640. Its totient is φ = 1236059136.

The previous prime is 2161651153. The next prime is 2161651171. The reversal of 2161651167 is 7611561612.

It is a happy number.

2161651167 is a `hidden beast` number, since 21 + 61 + 6 + 511 + 67 = 666.

2161651167 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2161651167 - 2⁶ = 2161651103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161653167) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 150253 + ... + 164009.

It is an arithmetic number, because the mean of its divisors is an integer number (75118680).

Almost surely, 2^2161651167 is an apocalyptic number.

2161651167 is a deficient number, since it is larger than the sum of its proper divisors (1444045473).

2161651167 is a wasteful number, since it uses less digits than its factorization.

2161651167 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13872 (or 13869 counting only the distinct ones).

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

The square root of 2161651167 is about 46493.5604895990. The cubic root of 2161651167 is about 1292.9901126678.

The spelling of 2161651167 in words is "two billion, one hundred sixty-one million, six hundred fifty-one thousand, one hundred sixty-seven".