51798573649 has 3 divisors (see below), whose sum is σ = 51798801243. Its totient is φ = 51798346056.

The previous prime is 51798573637. The next prime is 51798573653. The reversal of 51798573649 is 94637589715.

The square root of 51798573649 is 227593.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 51740326225 + 58247424 = 227465^2 + 7632^2 .

It is not a de Polignac number, because 51798573649 - 2¹³ = 51798565457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51798573049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 113797 + ... + 341389.

It is an arithmetic number, because the mean of its divisors is an integer number (17266267081).

Almost surely, 2^51798573649 is an apocalyptic number.

51798573649 is the 227593-rd square number.

51798573649 is the 113797-th centered octagonal number.

It is an amenable number.

51798573649 is a deficient number, since it is larger than the sum of its proper divisors (227594).

51798573649 is an frugal number, since it uses more digits than its factorization.

51798573649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455186 (or 227593 counting only the distinct ones).

The product of its digits is 57153600, while the sum is 64.

Multiplying 51798573649 by its sum of digits (64), we get a square (3315108713536 = 1820744²).

The spelling of 51798573649 in words is "fifty-one billion, seven hundred ninety-eight million, five hundred seventy-three thousand, six hundred forty-nine".