51510535442 has 8 divisors (see below), whose sum is σ = 77326312716. Its totient is φ = 25735097872.

The previous prime is 51510535423. The next prime is 51510535519. The reversal of 51510535442 is 24453501515.

51510535442 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 49182376441 + 2328159001 = 221771^2 + 48251^2 .

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

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, 10081733 + ... + 10086840.

Almost surely, 2^51510535442 is an apocalyptic number.

51510535442 is a deficient number, since it is larger than the sum of its proper divisors (25815777274).

51510535442 is a wasteful number, since it uses less digits than its factorization.

51510535442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20169852.

The product of its (nonzero) digits is 60000, while the sum is 35.

The spelling of 51510535442 in words is "fifty-one billion, five hundred ten million, five hundred thirty-five thousand, four hundred forty-two".