537721957782 has 128 divisors (see below), whose sum is σ = 1277786966400. Its totient is φ = 167351961600.

The previous prime is 537721957781. The next prime is 537721957813. The reversal of 537721957782 is 287759127735.

It is a happy number.

537721957782 is a `hidden beast` number, since 5 + 37 + 7 + 21 + 9 + 577 + 8 + 2 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (537721957781) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4943194 + ... + 5050802.

It is an arithmetic number, because the mean of its divisors is an integer number (9982710675).

Almost surely, 2^537721957782 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 537721957782, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (638893483200).

537721957782 is an abundant number, since it is smaller than the sum of its proper divisors (740065008618).

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

537721957782 is a wasteful number, since it uses less digits than its factorization.

537721957782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107759 (or 107753 counting only the distinct ones).

The product of its digits is 51861600, while the sum is 63.

The spelling of 537721957782 in words is "five hundred thirty-seven billion, seven hundred twenty-one million, nine hundred fifty-seven thousand, seven hundred eighty-two".