2161061263403 has 16 divisors (see below), whose sum is σ = 2477342085120. Its totient is φ = 1846673267616.

The previous prime is 2161061263397. The next prime is 2161061263451. The reversal of 2161061263403 is 3043621601612.

It is a cyclic number.

It is not a de Polignac number, because 2161061263403 - 2³² = 2156766296107 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2161061263903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7626953 + ... + 7905221.

It is an arithmetic number, because the mean of its divisors is an integer number (154833880320).

Almost surely, 2^{2161061263403} is an apocalyptic number.

2161061263403 is a deficient number, since it is larger than the sum of its proper divisors (316280821717).

2161061263403 is a wasteful number, since it uses less digits than its factorization.

2161061263403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281666.

The product of its (nonzero) digits is 31104, while the sum is 35.

The spelling of 2161061263403 in words is "two trillion, one hundred sixty-one billion, sixty-one million, two hundred sixty-three thousand, four hundred three".