51511007220 has 48 divisors (see below), whose sum is σ = 144290317248. Its totient is φ = 13730602240.

The previous prime is 51511007147. The next prime is 51511007227. The reversal of 51511007220 is 2270011515.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51511007227) 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, 29394 + ... + 322313.

It is an arithmetic number, because the mean of its divisors is an integer number (3006048276).

Almost surely, 2^51511007220 is an apocalyptic number.

It is an amenable number.

51511007220 is an abundant number, since it is smaller than the sum of its proper divisors (92779310028).

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

51511007220 is a wasteful number, since it uses less digits than its factorization.

51511007220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 354160 (or 354158 counting only the distinct ones).

The product of its (nonzero) digits is 700, while the sum is 24.

Adding to 51511007220 its reverse (2270011515), we get a palindrome (53781018735).

The spelling of 51511007220 in words is "fifty-one billion, five hundred eleven million, seven thousand, two hundred twenty".