61171321744 has 20 divisors (see below), whose sum is σ = 127636315996. Its totient is φ = 28232917632.

The previous prime is 61171321723. The next prime is 61171321753. The reversal of 61171321744 is 44712317116.

It can be written as a sum of positive squares in 2 ways, for example, as 5257990144 + 55913331600 = 72512^2 + 236460^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 147046239 + ... + 147046654.

Almost surely, 2^61171321744 is an apocalyptic number.

It is an amenable number.

61171321744 is an abundant number, since it is smaller than the sum of its proper divisors (66464994252).

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

61171321744 is a wasteful number, since it uses less digits than its factorization.

61171321744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294092914 (or 294092908 counting only the distinct ones).

The product of its digits is 28224, while the sum is 37.

The spelling of 61171321744 in words is "sixty-one billion, one hundred seventy-one million, three hundred twenty-one thousand, seven hundred forty-four".