666668631552 has 960 divisors, whose sum is σ = 2420692065792. Its totient is φ = 158957568000.

The previous prime is 666668631527. The next prime is 666668631557. The reversal of 666668631552 is 255136866666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666668631557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 951024802 + ... + 951025502.

Almost surely, 2^666668631552 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 666668631552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1210346032896).

666668631552 is an abundant number, since it is smaller than the sum of its proper divisors (1754023434240).

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

666668631552 is a wasteful number, since it uses less digits than its factorization.

666668631552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 811 (or 784 counting only the distinct ones).

The product of its digits is 55987200, while the sum is 60.

The spelling of 666668631552 in words is "six hundred sixty-six billion, six hundred sixty-eight million, six hundred thirty-one thousand, five hundred fifty-two".