66665158380 has 192 divisors, whose sum is σ = 214708838400. Its totient is φ = 17154443520.

The previous prime is 66665158361. The next prime is 66665158397. The reversal of 66665158380 is 8385156666.

It is a Harshad number since it is a multiple of its sum of digits (54).

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, 6004114 + ... + 6015206.

It is an arithmetic number, because the mean of its divisors is an integer number (1118275200).

Almost surely, 2^66665158380 is an apocalyptic number.

66665158380 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 66665158380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107354419200).

66665158380 is an abundant number, since it is smaller than the sum of its proper divisors (148043680020).

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

66665158380 is a wasteful number, since it uses less digits than its factorization.

66665158380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11501 (or 11493 counting only the distinct ones).

The product of its (nonzero) digits is 6220800, while the sum is 54.

The spelling of 66665158380 in words is "sixty-six billion, six hundred sixty-five million, one hundred fifty-eight thousand, three hundred eighty".