51220105142550 has 48 divisors (see below), whose sum is σ = 127146953480400. Its totient is φ = 13645673981440.

The previous prime is 51220105142513. The next prime is 51220105142567. The reversal of 51220105142550 is 5524150102215.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 162601167 + ... + 162915866.

It is an arithmetic number, because the mean of its divisors is an integer number (2648894864175).

Almost surely, 2^{51220105142550} is an apocalyptic number.

51220105142550 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

51220105142550 is an abundant number, since it is smaller than the sum of its proper divisors (75926848337850).

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

51220105142550 is a wasteful number, since it uses less digits than its factorization.

51220105142550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325518097 (or 325518092 counting only the distinct ones).

The product of its (nonzero) digits is 20000, while the sum is 33.

Adding to 51220105142550 its reverse (5524150102215), we get a palindrome (56744255244765).

The spelling of 51220105142550 in words is "fifty-one trillion, two hundred twenty billion, one hundred five million, one hundred forty-two thousand, five hundred fifty".