51321413545 has 4 divisors (see below), whose sum is σ = 61585696260. Its totient is φ = 41057130832.

The previous prime is 51321413527. The next prime is 51321413569. The reversal of 51321413545 is 54531412315.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54531412315 = 5 ⋅10906282463.

It can be written as a sum of positive squares in 2 ways, for example, as 34075683216 + 17245730329 = 184596^2 + 131323^2 .

It is a cyclic number.

It is not a de Polignac number, because 51321413545 - 2⁷ = 51321413417 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51321413545.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5132141350 + ... + 5132141359.

It is an arithmetic number, because the mean of its divisors is an integer number (15396424065).

Almost surely, 2^51321413545 is an apocalyptic number.

It is an amenable number.

51321413545 is a deficient number, since it is larger than the sum of its proper divisors (10264282715).

51321413545 is a wasteful number, since it uses less digits than its factorization.

51321413545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10264282714.

The product of its digits is 36000, while the sum is 34.

The spelling of 51321413545 in words is "fifty-one billion, three hundred twenty-one million, four hundred thirteen thousand, five hundred forty-five".