66526165421760 has 224 divisors, whose sum is σ = 230648166169344. Its totient is φ = 16111756800000.

The previous prime is 66526165421731. The next prime is 66526165421761. The reversal of 66526165421760 is 6712456162566.

It is a self number, because there is not a number n which added to its sum of digits gives 66526165421760.

It is not an unprimeable number, because it can be changed into a prime (66526165421761) 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, 7696635 + ... + 13866885.

It is an arithmetic number, because the mean of its divisors is an integer number (1029679313256).

Almost surely, 2^{66526165421760} is an apocalyptic number.

66526165421760 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 66526165421760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (115324083084672).

66526165421760 is an abundant number, since it is smaller than the sum of its proper divisors (164122000747584).

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

66526165421760 is a wasteful number, since it uses less digits than its factorization.

66526165421760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6171303 (or 6171293 counting only the distinct ones).

The product of its (nonzero) digits is 21772800, while the sum is 57.

The spelling of 66526165421760 in words is "sixty-six trillion, five hundred twenty-six billion, one hundred sixty-five million, four hundred twenty-one thousand, seven hundred sixty".