51779783631550 has 48 divisors (see below), whose sum is σ = 103730824083600. Its totient is φ = 19116489450240.

The previous prime is 51779783631533. The next prime is 51779783631551. The reversal of 51779783631550 is 5513638797715.

It is a super-2 number, since 2×51779783631550² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51779783631551) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1075594 + ... + 10233106.

It is an arithmetic number, because the mean of its divisors is an integer number (2161058835075).

Almost surely, 2^{51779783631550} is an apocalyptic number.

51779783631550 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

51779783631550 is an abundant number, since it is smaller than the sum of its proper divisors (51951040452050).

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

51779783631550 is a wasteful number, since it uses less digits than its factorization.

51779783631550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9166237 (or 9166232 counting only the distinct ones).

The product of its (nonzero) digits is 166698000, while the sum is 67.

The spelling of 51779783631550 in words is "fifty-one trillion, seven hundred seventy-nine billion, seven hundred eighty-three million, six hundred thirty-one thousand, five hundred fifty".