51135540223 has 8 divisors (see below), whose sum is σ = 51579279360. Its totient is φ = 50692443480.

The previous prime is 51135540217. The next prime is 51135540227. The reversal of 51135540223 is 32204553115.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51135540223 - 2⁹ = 51135539711 is a prime.

It is a super-2 number, since 2×51135540223² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51135540227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13 + ... + 319798.

It is an arithmetic number, because the mean of its divisors is an integer number (6447409920).

Almost surely, 2^51135540223 is an apocalyptic number.

51135540223 is a deficient number, since it is larger than the sum of its proper divisors (443739137).

51135540223 is a wasteful number, since it uses less digits than its factorization.

51135540223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321197.

The product of its (nonzero) digits is 18000, while the sum is 31.

The spelling of 51135540223 in words is "fifty-one billion, one hundred thirty-five million, five hundred forty thousand, two hundred twenty-three".