61871057544 has 64 divisors (see below), whose sum is σ = 158929807680. Its totient is φ = 20059776000.

The previous prime is 61871057527. The next prime is 61871057551. The reversal of 61871057544 is 44575017816.

It is a super-2 number, since 2×61871057544² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 61871057493 and 61871057502.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 230724 + ... + 420684.

It is an arithmetic number, because the mean of its divisors is an integer number (2483278245).

Almost surely, 2^61871057544 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 61871057544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79464903840).

61871057544 is an abundant number, since it is smaller than the sum of its proper divisors (97058750136).

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

61871057544 is a wasteful number, since it uses less digits than its factorization.

61871057544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190342 (or 190338 counting only the distinct ones).

The product of its (nonzero) digits is 940800, while the sum is 48.

The spelling of 61871057544 in words is "sixty-one billion, eight hundred seventy-one million, fifty-seven thousand, five hundred forty-four".