2161658835 has 24 divisors (see below), whose sum is σ = 4282143840. Its totient is φ = 988186752.

The previous prime is 2161658831. The next prime is 2161658929. The reversal of 2161658835 is 5388561612.

2161658835 is a `hidden beast` number, since 2 + 1 + 61 + 6 + 588 + 3 + 5 = 666.

It is not a de Polignac number, because 2161658835 - 2² = 2161658831 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (2161658831) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3430890 + ... + 3431519.

It is an arithmetic number, because the mean of its divisors is an integer number (178422660).

Almost surely, 2^2161658835 is an apocalyptic number.

2161658835 is a deficient number, since it is larger than the sum of its proper divisors (2120485005).

2161658835 is a wasteful number, since it uses less digits than its factorization.

2161658835 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6862427 (or 6862424 counting only the distinct ones).

The product of its digits is 345600, while the sum is 45.

The square root of 2161658835 is about 46493.6429525586. The cubic root of 2161658835 is about 1292.9916415356.

The spelling of 2161658835 in words is "two billion, one hundred sixty-one million, six hundred fifty-eight thousand, eight hundred thirty-five".