2161761078 has 8 divisors (see below), whose sum is σ = 4323522168. Its totient is φ = 720587024.

The previous prime is 2161761047. The next prime is 2161761101. The reversal of 2161761078 is 8701671612.

2161761078 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

2161761078 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 180146751 + ... + 180146762.

It is an arithmetic number, because the mean of its divisors is an integer number (540440271).

Almost surely, 2^2161761078 is an apocalyptic number.

2161761078 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

2161761078 is a wasteful number, since it uses less digits than its factorization.

2161761078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360293518.

The product of its (nonzero) digits is 28224, while the sum is 39.

The square root of 2161761078 is about 46494.7424769726. The cubic root of 2161761078 is about 1293.0120266920.

The spelling of 2161761078 in words is "two billion, one hundred sixty-one million, seven hundred sixty-one thousand, seventy-eight".