61438444722 has 54 divisors (see below), whose sum is σ = 136898312733. Its totient is φ = 19913362704.

The previous prime is 61438444709. The next prime is 61438444723. The reversal of 61438444722 is 22744483416.

61438444722 is a `hidden beast` number, since 61 + 43 + 84 + 4 + 472 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 49568124321 + 11870320401 = 222639^2 + 108951^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=175269.

It is not an unprimeable number, because it can be changed into a prime (61438444723) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 38908929 + ... + 38910507.

Almost surely, 2^61438444722 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61438444722

61438444722 is an abundant number, since it is smaller than the sum of its proper divisors (75459868011).

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

61438444722 is an equidigital number, since it uses as much as digits as its factorization.

61438444722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3240 (or 1621 counting only the distinct ones).

The product of its digits is 1032192, while the sum is 45.

The spelling of 61438444722 in words is "sixty-one billion, four hundred thirty-eight million, four hundred forty-four thousand, seven hundred twenty-two".