261421716560373 has 48 divisors (see below), whose sum is σ = 389162971117440. Its totient is φ = 168982009840512.

The previous prime is 261421716560369. The next prime is 261421716560393. The reversal of 261421716560373 is 373065617124162.

261421716560373 is a `hidden beast` number, since 2 + 6 + 1 + 4 + 2 + 1 + 7 + 1 + 6 + 560 + 3 + 73 = 666.

It is not a de Polignac number, because 261421716560373 - 2² = 261421716560369 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261421716560393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 172949290 + ... + 174454292.

It is an arithmetic number, because the mean of its divisors is an integer number (8107561898280).

Almost surely, 2^{261421716560373} is an apocalyptic number.

It is an amenable number.

261421716560373 is a deficient number, since it is larger than the sum of its proper divisors (127741254557067).

261421716560373 is a wasteful number, since it uses less digits than its factorization.

261421716560373 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1506858 (or 1506855 counting only the distinct ones).

The product of its (nonzero) digits is 7620480, while the sum is 54.

The spelling of 261421716560373 in words is "two hundred sixty-one trillion, four hundred twenty-one billion, seven hundred sixteen million, five hundred sixty thousand, three hundred seventy-three".