51685372452 has 48 divisors (see below), whose sum is σ = 137841500160. Its totient is φ = 14765766432.

The previous prime is 51685372441. The next prime is 51685372477. The reversal of 51685372452 is 25427358615.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1023583 + ... + 1072889.

It is an arithmetic number, because the mean of its divisors is an integer number (2871697920).

Almost surely, 2^51685372452 is an apocalyptic number.

It is an amenable number.

51685372452 is an abundant number, since it is smaller than the sum of its proper divisors (86156127708).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51685372452 is a wasteful number, since it uses less digits than its factorization.

51685372452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61800 (or 61798 counting only the distinct ones).

The product of its digits is 2016000, while the sum is 48.

The spelling of 51685372452 in words is "fifty-one billion, six hundred eighty-five million, three hundred seventy-two thousand, four hundred fifty-two".