61873558221 has 16 divisors (see below), whose sum is σ = 82951557120. Its totient is φ = 41022412080.

The previous prime is 61873558213. The next prime is 61873558267. The reversal of 61873558221 is 12285537816.

It is not a de Polignac number, because 61873558221 - 2³ = 61873558213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61873558291) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2625790 + ... + 2649248.

It is an arithmetic number, because the mean of its divisors is an integer number (5184472320).

Almost surely, 2^61873558221 is an apocalyptic number.

It is an amenable number.

61873558221 is a deficient number, since it is larger than the sum of its proper divisors (21077998899).

61873558221 is a wasteful number, since it uses less digits than its factorization.

61873558221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28256.

The product of its digits is 806400, while the sum is 48.

The spelling of 61873558221 in words is "sixty-one billion, eight hundred seventy-three million, five hundred fifty-eight thousand, two hundred twenty-one".