51188503640 has 64 divisors (see below), whose sum is σ = 117390461760. Its totient is φ = 20084323840.

The previous prime is 51188503637. The next prime is 51188503657. The reversal of 51188503640 is 4630588115.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 513734 + ... + 605226.

It is an arithmetic number, because the mean of its divisors is an integer number (1834225965).

Almost surely, 2^51188503640 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 51188503640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (58695230880).

51188503640 is an abundant number, since it is smaller than the sum of its proper divisors (66201958120).

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

51188503640 is a wasteful number, since it uses less digits than its factorization.

51188503640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91772 (or 91768 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 41.

The spelling of 51188503640 in words is "fifty-one billion, one hundred eighty-eight million, five hundred three thousand, six hundred forty".