51220142353351 has 16 divisors (see below), whose sum is σ = 52990679589120. Its totient is φ = 49484216658240.

The previous prime is 51220142353327. The next prime is 51220142353379. The reversal of 51220142353351 is 15335324102215.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51220142353351 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51220142353351.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51220142354351) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18221265 + ... + 20843578.

It is an arithmetic number, because the mean of its divisors is an integer number (3311917474320).

Almost surely, 2^{51220142353351} is an apocalyptic number.

51220142353351 is a deficient number, since it is larger than the sum of its proper divisors (1770537235769).

51220142353351 is a wasteful number, since it uses less digits than its factorization.

51220142353351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39065286.

The product of its (nonzero) digits is 108000, while the sum is 37.

Adding to 51220142353351 its reverse (15335324102215), we get a palindrome (66555466455566).

The spelling of 51220142353351 in words is "fifty-one trillion, two hundred twenty billion, one hundred forty-two million, three hundred fifty-three thousand, three hundred fifty-one".