51386584620 has 96 divisors (see below), whose sum is σ = 164664235008. Its totient is φ = 11729279232.

The previous prime is 51386584603. The next prime is 51386584631. The reversal of 51386584620 is 2648568315.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 51386584620.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 221194 + ... + 389486.

It is an arithmetic number, because the mean of its divisors is an integer number (1715252448).

Almost surely, 2^51386584620 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51386584620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82332117504).

51386584620 is an abundant number, since it is smaller than the sum of its proper divisors (113277650388).

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

51386584620 is a wasteful number, since it uses less digits than its factorization.

51386584620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169039 (or 169037 counting only the distinct ones).

The product of its (nonzero) digits is 1382400, while the sum is 48.

The spelling of 51386584620 in words is "fifty-one billion, three hundred eighty-six million, five hundred eighty-four thousand, six hundred twenty".