2161501604155 has 32 divisors (see below), whose sum is σ = 2649920832000. Its totient is φ = 1691970588672.

The previous prime is 2161501604149. The next prime is 2161501604173. The reversal of 2161501604155 is 5514061051612.

It is a cyclic number.

It is not a de Polignac number, because 2161501604155 - 2⁵ = 2161501604123 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 247391947 + ... + 247400683.

It is an arithmetic number, because the mean of its divisors is an integer number (82810026000).

Almost surely, 2^{2161501604155} is an apocalyptic number.

2161501604155 is a deficient number, since it is larger than the sum of its proper divisors (488419227845).

2161501604155 is a wasteful number, since it uses less digits than its factorization.

2161501604155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11223.

The product of its (nonzero) digits is 36000, while the sum is 37.

Adding to 2161501604155 its reverse (5514061051612), we get a palindrome (7675562655767).

The spelling of 2161501604155 in words is "two trillion, one hundred sixty-one billion, five hundred one million, six hundred four thousand, one hundred fifty-five".