2161658208 has 48 divisors (see below), whose sum is σ = 5679688896. Its totient is φ = 719875200.

The previous prime is 2161658201. The next prime is 2161658249. The reversal of 2161658208 is 8028561612.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161658201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97783 + ... + 117833.

It is an arithmetic number, because the mean of its divisors is an integer number (118326852).

Almost surely, 2^2161658208 is an apocalyptic number.

It is an amenable number.

2161658208 is an abundant number, since it is smaller than the sum of its proper divisors (3518030688).

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

2161658208 is a wasteful number, since it uses less digits than its factorization.

2161658208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21187 (or 21179 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 39.

The square root of 2161658208 is about 46493.6362097008. The cubic root of 2161658208 is about 1292.9915165227.

The spelling of 2161658208 in words is "two billion, one hundred sixty-one million, six hundred fifty-eight thousand, two hundred eight".