51356206220 has 96 divisors (see below), whose sum is σ = 120254803200. Its totient is φ = 18265363200.

The previous prime is 51356206217. The next prime is 51356206241. The reversal of 51356206220 is 2260265315.

It is a super-2 number, since 2×51356206220² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2391491 + ... + 2412869.

It is an arithmetic number, because the mean of its divisors is an integer number (1252654200).

Almost surely, 2^51356206220 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 51356206220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60127401600).

51356206220 is an abundant number, since it is smaller than the sum of its proper divisors (68898596980).

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

51356206220 is a wasteful number, since it uses less digits than its factorization.

51356206220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21639 (or 21637 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 32.

The spelling of 51356206220 in words is "fifty-one billion, three hundred fifty-six million, two hundred six thousand, two hundred twenty".