51520343422 has 16 divisors (see below), whose sum is σ = 81719132544. Its totient is φ = 24321168000.

The previous prime is 51520343419. The next prime is 51520343423. The reversal of 51520343422 is 22434302515.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51520343423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10131279 + ... + 10136362.

It is an arithmetic number, because the mean of its divisors is an integer number (5107445784).

Almost surely, 2^51520343422 is an apocalyptic number.

51520343422 is a deficient number, since it is larger than the sum of its proper divisors (30198789122).

51520343422 is a wasteful number, since it uses less digits than its factorization.

51520343422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20267715.

The product of its (nonzero) digits is 28800, while the sum is 31.

Adding to 51520343422 its reverse (22434302515), we get a palindrome (73954645937).

The spelling of 51520343422 in words is "fifty-one billion, five hundred twenty million, three hundred forty-three thousand, four hundred twenty-two".