51345550550 has 48 divisors (see below), whose sum is σ = 109931297280. Its totient is φ = 17477523360.

The previous prime is 51345550547. The next prime is 51345550561. The reversal of 51345550550 is 5505554315.

It is a happy number.

It is a super-2 number, since 2×51345550550² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 479054 + ... + 576353.

It is an arithmetic number, because the mean of its divisors is an integer number (2290235360).

Almost surely, 2^51345550550 is an apocalyptic number.

51345550550 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

51345550550 is an abundant number, since it is smaller than the sum of its proper divisors (58585746730).

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

51345550550 is a wasteful number, since it uses less digits than its factorization.

51345550550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1055565 (or 1055560 counting only the distinct ones).

The product of its (nonzero) digits is 187500, while the sum is 38.

The spelling of 51345550550 in words is "fifty-one billion, three hundred forty-five million, five hundred fifty thousand, five hundred fifty".