51220055423 has 4 divisors (see below), whose sum is σ = 51303612408. Its totient is φ = 51136498440.

The previous prime is 51220055417. The next prime is 51220055431. The reversal of 51220055423 is 32455002215.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51220055423 - 2¹² = 51220051327 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51220055023) 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, 41777573 + ... + 41778798.

It is an arithmetic number, because the mean of its divisors is an integer number (12825903102).

Almost surely, 2^51220055423 is an apocalyptic number.

51220055423 is a deficient number, since it is larger than the sum of its proper divisors (83556985).

51220055423 is an equidigital number, since it uses as much as digits as its factorization.

51220055423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83556984.

The product of its (nonzero) digits is 12000, while the sum is 29.

Adding to 51220055423 its reverse (32455002215), we get a palindrome (83675057638).

The spelling of 51220055423 in words is "fifty-one billion, two hundred twenty million, fifty-five thousand, four hundred twenty-three".