2161513555 has 8 divisors (see below), whose sum is σ = 2595380400. Its totient is φ = 1728168096.

The previous prime is 2161513553. The next prime is 2161513559. The reversal of 2161513555 is 5553151612.

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

It is a cyclic number.

It is not a de Polignac number, because 2161513555 - 2¹ = 2161513553 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2161513555.

It is not an unprimeable number, because it can be changed into a prime (2161513553) 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, 121165 + ... + 137854.

It is an arithmetic number, because the mean of its divisors is an integer number (324422550).

Almost surely, 2^2161513555 is an apocalyptic number.

2161513555 is a deficient number, since it is larger than the sum of its proper divisors (433866845).

2161513555 is a wasteful number, since it uses less digits than its factorization.

2161513555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260693.

The product of its digits is 22500, while the sum is 34.

The square root of 2161513555 is about 46492.0805621775. The cubic root of 2161513555 is about 1292.9626745788.

The spelling of 2161513555 in words is "two billion, one hundred sixty-one million, five hundred thirteen thousand, five hundred fifty-five".