51605540223 has 16 divisors (see below), whose sum is σ = 71217727200. Its totient is φ = 33199779200.

The previous prime is 51605540213. The next prime is 51605540227. The reversal of 51605540223 is 32204550615.

It is a cyclic number.

It is not a de Polignac number, because 51605540223 - 2²¹ = 51603443071 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51605540227) 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, 9373 + ... + 321401.

It is an arithmetic number, because the mean of its divisors is an integer number (4451107950).

Almost surely, 2^51605540223 is an apocalyptic number.

51605540223 is a deficient number, since it is larger than the sum of its proper divisors (19612186977).

51605540223 is a wasteful number, since it uses less digits than its factorization.

51605540223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313962.

The product of its (nonzero) digits is 36000, while the sum is 33.

The spelling of 51605540223 in words is "fifty-one billion, six hundred five million, five hundred forty thousand, two hundred twenty-three".