531706994784 has 144 divisors (see below), whose sum is σ = 1728482988960. Its totient is φ = 151878021120.

The previous prime is 531706994783. The next prime is 531706994809. The reversal of 531706994784 is 487499607135.

531706994784 is a `hidden beast` number, since 5 + 3 + 1 + 70 + 6 + 99 + 478 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531706994783) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8518762 + ... + 8580950.

It is an arithmetic number, because the mean of its divisors is an integer number (12003354090).

Almost surely, 2^531706994784 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 531706994784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (864241494480).

531706994784 is an abundant number, since it is smaller than the sum of its proper divisors (1196775994176).

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

531706994784 is a wasteful number, since it uses less digits than its factorization.

531706994784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66453 (or 66442 counting only the distinct ones).

The product of its (nonzero) digits is 45722880, while the sum is 63.

The spelling of 531706994784 in words is "five hundred thirty-one billion, seven hundred six million, nine hundred ninety-four thousand, seven hundred eighty-four".