531145062666 has 128 divisors (see below), whose sum is σ = 1218634502400. Its totient is φ = 171375160320.

The previous prime is 531145062629. The next prime is 531145062667. The reversal of 531145062666 is 666260541135.

It is not an unprimeable number, because it can be changed into a prime (531145062667) 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, 158691205 + ... + 158694551.

It is an arithmetic number, because the mean of its divisors is an integer number (9520582050).

Almost surely, 2^531145062666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 531145062666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (609317251200).

531145062666 is an abundant number, since it is smaller than the sum of its proper divisors (687489439734).

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

531145062666 is a wasteful number, since it uses less digits than its factorization.

531145062666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3941 (or 3935 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 45.

The spelling of 531145062666 in words is "five hundred thirty-one billion, one hundred forty-five million, sixty-two thousand, six hundred sixty-six".