51687985077550 has 24 divisors (see below), whose sum is σ = 96140239985736. Its totient is φ = 20675067635040.

The previous prime is 51687985077527. The next prime is 51687985077563. The reversal of 51687985077550 is 5577058978615.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5326272 + ... + 11478028.

It is an arithmetic number, because the mean of its divisors is an integer number (4005843332739).

Almost surely, 2^{51687985077550} is an apocalyptic number.

51687985077550 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

51687985077550 is a deficient number, since it is larger than the sum of its proper divisors (44452254908186).

51687985077550 is a wasteful number, since it uses less digits than its factorization.

51687985077550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6319812 (or 6319807 counting only the distinct ones).

The product of its (nonzero) digits is 740880000, while the sum is 73.

The spelling of 51687985077550 in words is "fifty-one trillion, six hundred eighty-seven billion, nine hundred eighty-five million, seventy-seven thousand, five hundred fifty".