51520420111 has 16 divisors (see below), whose sum is σ = 52765615840. Its totient is φ = 50289102720.

The previous prime is 51520420109. The next prime is 51520420117. The reversal of 51520420111 is 11102402515.

It is not a de Polignac number, because 51520420111 - 2¹ = 51520420109 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 (51520420117) 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, 7284685 + ... + 7291753.

It is an arithmetic number, because the mean of its divisors is an integer number (3297850990).

Almost surely, 2^51520420111 is an apocalyptic number.

51520420111 is a deficient number, since it is larger than the sum of its proper divisors (1245195729).

51520420111 is a wasteful number, since it uses less digits than its factorization.

51520420111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8026.

The product of its (nonzero) digits is 400, while the sum is 22.

Adding to 51520420111 its reverse (11102402515), we get a palindrome (62622822626).

The spelling of 51520420111 in words is "fifty-one billion, five hundred twenty million, four hundred twenty thousand, one hundred eleven".