51638005372 has 12 divisors (see below), whose sum is σ = 90651579480. Its totient is φ = 25737554096.

The previous prime is 51638005283. The next prime is 51638005373. The reversal of 51638005372 is 27350083615.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51638005373) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20360722 + ... + 20363257.

It is an arithmetic number, because the mean of its divisors is an integer number (7554298290).

Almost surely, 2^51638005372 is an apocalyptic number.

It is an amenable number.

51638005372 is a deficient number, since it is larger than the sum of its proper divisors (39013574108).

51638005372 is a wasteful number, since it uses less digits than its factorization.

51638005372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40724300 (or 40724298 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 40.

Adding to 51638005372 its reverse (27350083615), we get a palindrome (78988088987).

The spelling of 51638005372 in words is "fifty-one billion, six hundred thirty-eight million, five thousand, three hundred seventy-two".