66139012642560 has 576 divisors, whose sum is σ = 248205841906176. Its totient is φ = 14797607731200.

The previous prime is 66139012642559. The next prime is 66139012642607. The reversal of 66139012642560 is 6524621093166.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5145797094 + ... + 5145809946.

It is an arithmetic number, because the mean of its divisors is an integer number (430912919976).

Almost surely, 2^{66139012642560} is an apocalyptic number.

66139012642560 is a gapful number since it is divisible by the number (60) 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 66139012642560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (124102920953088).

66139012642560 is an abundant number, since it is smaller than the sum of its proper divisors (182066829263616).

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

66139012642560 is a wasteful number, since it uses less digits than its factorization.

66139012642560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22272 (or 22258 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 51.

The spelling of 66139012642560 in words is "sixty-six trillion, one hundred thirty-nine billion, twelve million, six hundred forty-two thousand, five hundred sixty".