66251144568 has 128 divisors (see below), whose sum is σ = 191153571840. Its totient is φ = 18743088000.

The previous prime is 66251144549. The next prime is 66251144621. The reversal of 66251144568 is 86544115266.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10802863 + ... + 10808993.

It is an arithmetic number, because the mean of its divisors is an integer number (1493387280).

Almost surely, 2^66251144568 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 66251144568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95576785920).

66251144568 is an abundant number, since it is smaller than the sum of its proper divisors (124902427272).

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

66251144568 is a wasteful number, since it uses less digits than its factorization.

66251144568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6769 (or 6765 counting only the distinct ones).

The product of its digits is 1382400, while the sum is 48.

The spelling of 66251144568 in words is "sixty-six billion, two hundred fifty-one million, one hundred forty-four thousand, five hundred sixty-eight".