51520475318 has 32 divisors (see below), whose sum is σ = 87527817216. Its totient is φ = 22565698848.

The previous prime is 51520475317. The next prime is 51520475329. The reversal of 51520475318 is 81357402515.

It is a happy number.

It is a super-2 number, since 2×51520475318² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51520475317) 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, 263246 + ... + 415137.

It is an arithmetic number, because the mean of its divisors is an integer number (2735244288).

Almost surely, 2^51520475318 is an apocalyptic number.

51520475318 is a deficient number, since it is larger than the sum of its proper divisors (36007341898).

51520475318 is a wasteful number, since it uses less digits than its factorization.

51520475318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 678548.

The product of its (nonzero) digits is 168000, while the sum is 41.

The spelling of 51520475318 in words is "fifty-one billion, five hundred twenty million, four hundred seventy-five thousand, three hundred eighteen".