2161642653 has 32 divisors (see below), whose sum is σ = 3248398080. Its totient is φ = 1420554240.

The previous prime is 2161642643. The next prime is 2161642657. The reversal of 2161642653 is 3562461612.

2161642653 is a `hidden beast` number, since 2 + 1 + 6 + 1 + 642 + 6 + 5 + 3 = 666.

It is not a de Polignac number, because 2161642653 - 2¹⁷ = 2161511581 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161642657) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 587008 + ... + 590678.

It is an arithmetic number, because the mean of its divisors is an integer number (101512440).

Almost surely, 2^2161642653 is an apocalyptic number.

It is an amenable number.

2161642653 is a deficient number, since it is larger than the sum of its proper divisors (1086755427).

2161642653 is a wasteful number, since it uses less digits than its factorization.

2161642653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3986 (or 3980 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 2161642653 is about 46493.4689284420. The cubic root of 2161642653 is about 1292.9884151179.

The spelling of 2161642653 in words is "two billion, one hundred sixty-one million, six hundred forty-two thousand, six hundred fifty-three".