51445220000 has 60 divisors (see below), whose sum is σ = 126563007186. Its totient is φ = 20578080000.

The previous prime is 51445219981. The next prime is 51445220009. The reversal of 51445220000 is 2254415.

It is a happy number.

It can be written as a sum of positive squares in 5 ways, for example, as 1971004816 + 49474215184 = 44396^2 + 222428^2 .

It is a super-2 number, since 2×51445220000² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51445220009) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1266131 + ... + 1306130.

Almost surely, 2^51445220000 is an apocalyptic number.

51445220000 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51445220000 is an abundant number, since it is smaller than the sum of its proper divisors (75117787186).

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

51445220000 is an equidigital number, since it uses as much as digits as its factorization.

51445220000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2572291 (or 2572268 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 23.

Adding to 51445220000 its reverse (2254415), we get a palindrome (51447474415).

The spelling of 51445220000 in words is "fifty-one billion, four hundred forty-five million, two hundred twenty thousand".