531666617776 has 160 divisors (see below), whose sum is σ = 1281446946432. Its totient is φ = 208454860800.

The previous prime is 531666617747. The next prime is 531666617777. The reversal of 531666617776 is 677716666135.

It is not an unprimeable number, because it can be changed into a prime (531666617777) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 87141126 + ... + 87147226.

Almost surely, 2^531666617776 is an apocalyptic number.

531666617776 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 531666617776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (640723473216).

531666617776 is an abundant number, since it is smaller than the sum of its proper divisors (749780328656).

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

531666617776 is a wasteful number, since it uses less digits than its factorization.

531666617776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7407 (or 7401 counting only the distinct ones).

The product of its digits is 40007520, while the sum is 61.

The spelling of 531666617776 in words is "five hundred thirty-one billion, six hundred sixty-six million, six hundred seventeen thousand, seven hundred seventy-six".