51201611520 has 288 divisors, whose sum is σ = 165758261760. Its totient is φ = 13468876800.

The previous prime is 51201611477. The next prime is 51201611533. The reversal of 51201611520 is 2511610215.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 131623486 + ... + 131623874.

It is an arithmetic number, because the mean of its divisors is an integer number (575549520).

Almost surely, 2^51201611520 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51201611520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82879130880).

51201611520 is an abundant number, since it is smaller than the sum of its proper divisors (114556650240).

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

51201611520 is a wasteful number, since it uses less digits than its factorization.

51201611520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 791 (or 777 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 24.

The spelling of 51201611520 in words is "fifty-one billion, two hundred one million, six hundred eleven thousand, five hundred twenty".