2161670715 has 24 divisors (see below), whose sum is σ = 3789002880. Its totient is φ = 1139935104.

The previous prime is 2161670713. The next prime is 2161670723. The reversal of 2161670715 is 5170761612.

2161670715 is a `hidden beast` number, since 21 + 616 + 7 + 0 + 7 + 15 = 666.

It is not a de Polignac number, because 2161670715 - 2¹ = 2161670713 is a prime.

It is a super-2 number, since 2×2161670715² = 9345640560177222450, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2161670715.

It is not an unprimeable number, because it can be changed into a prime (2161670713) 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, 265867 + ... + 273876.

It is an arithmetic number, because the mean of its divisors is an integer number (157875120).

Almost surely, 2^2161670715 is an apocalyptic number.

2161670715 is a deficient number, since it is larger than the sum of its proper divisors (1627332165).

2161670715 is a wasteful number, since it uses less digits than its factorization.

2161670715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 539843 (or 539840 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 36.

The square root of 2161670715 is about 46493.7707117846. The cubic root of 2161670715 is about 1292.9940101969.

The spelling of 2161670715 in words is "two billion, one hundred sixty-one million, six hundred seventy thousand, seven hundred fifteen".