2161604403255 has 32 divisors (see below), whose sum is σ = 3773070620928. Its totient is φ = 1048026067200.

The previous prime is 2161604403239. The next prime is 2161604403271. The reversal of 2161604403255 is 5523044061612.

It is an interprime number because it is at equal distance from previous prime (2161604403239) and next prime (2161604403271).

It is not a de Polignac number, because 2161604403255 - 2⁴ = 2161604403239 is a prime.

It is a congruent number.

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, 8326932 + ... + 8582598.

It is an arithmetic number, because the mean of its divisors is an integer number (117908456904).

Almost surely, 2^{2161604403255} is an apocalyptic number.

2161604403255 is a deficient number, since it is larger than the sum of its proper divisors (1611466217673).

2161604403255 is a wasteful number, since it uses less digits than its factorization.

2161604403255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306927.

The product of its (nonzero) digits is 172800, while the sum is 39.

Adding to 2161604403255 its reverse (5523044061612), we get a palindrome (7684648464867).

The spelling of 2161604403255 in words is "two trillion, one hundred sixty-one billion, six hundred four million, four hundred three thousand, two hundred fifty-five".