51199441722 has 216 divisors, whose sum is σ = 139514137308. Its totient is φ = 13476925440.

The previous prime is 51199441717. The next prime is 51199441729. The reversal of 51199441722 is 22714499115.

51199441722 is a `hidden beast` number, since 51 + 1 + 99 + 441 + 72 + 2 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 45403512561 + 5795929161 = 213081^2 + 76131^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51199441729) by changing a digit.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 8179618 + ... + 8185874.

Almost surely, 2^51199441722 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51199441722, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69757068654).

51199441722 is an abundant number, since it is smaller than the sum of its proper divisors (88314695586).

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

51199441722 is a wasteful number, since it uses less digits than its factorization.

51199441722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6334 (or 6303 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The spelling of 51199441722 in words is "fifty-one billion, one hundred ninety-nine million, four hundred forty-one thousand, seven hundred twenty-two".