51533576321 has 4 divisors (see below), whose sum is σ = 51564491952. Its totient is φ = 51502660692.

The previous prime is 51533576261. The next prime is 51533576323. The reversal of 51533576321 is 12367533515.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51533576321 - 2²⁶ = 51466467457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51533576323) 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, 15455315 + ... + 15458648.

It is an arithmetic number, because the mean of its divisors is an integer number (12891122988).

Almost surely, 2^51533576321 is an apocalyptic number.

It is an amenable number.

51533576321 is a deficient number, since it is larger than the sum of its proper divisors (30915631).

51533576321 is a wasteful number, since it uses less digits than its factorization.

51533576321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30915630.

The product of its digits is 283500, while the sum is 41.

The spelling of 51533576321 in words is "fifty-one billion, five hundred thirty-three million, five hundred seventy-six thousand, three hundred twenty-one".