2161061420263 has 4 divisors (see below), whose sum is σ = 2161139716008. Its totient is φ = 2160983124520.

The previous prime is 2161061420201. The next prime is 2161061420267. The reversal of 2161061420263 is 3620241601612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2161061420263 - 2¹³ = 2161061412071 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161061420267) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39106456 + ... + 39161677.

It is an arithmetic number, because the mean of its divisors is an integer number (540284929002).

Almost surely, 2^{2161061420263} is an apocalyptic number.

2161061420263 is a deficient number, since it is larger than the sum of its proper divisors (78295745).

2161061420263 is an equidigital number, since it uses as much as digits as its factorization.

2161061420263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78295744.

The product of its (nonzero) digits is 20736, while the sum is 34.

The spelling of 2161061420263 in words is "two trillion, one hundred sixty-one billion, sixty-one million, four hundred twenty thousand, two hundred sixty-three".