51521775459 has 16 divisors (see below), whose sum is σ = 85646588160. Its totient is φ = 26764558560.

The previous prime is 51521775457. The next prime is 51521775479. The reversal of 51521775459 is 95457712515.

It is a happy number.

It is not a de Polignac number, because 51521775459 - 2¹ = 51521775457 is a prime.

It is a super-2 number, since 2×51521775459² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51521775457) 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, 111518764 + ... + 111519225.

It is an arithmetic number, because the mean of its divisors is an integer number (5352911760).

Almost surely, 2^51521775459 is an apocalyptic number.

51521775459 is a deficient number, since it is larger than the sum of its proper divisors (34124812701).

51521775459 is a wasteful number, since it uses less digits than its factorization.

51521775459 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223038010.

The product of its digits is 2205000, while the sum is 51.

The spelling of 51521775459 in words is "fifty-one billion, five hundred twenty-one million, seven hundred seventy-five thousand, four hundred fifty-nine".