66203647580 has 192 divisors, whose sum is σ = 168157237248. Its totient is φ = 21404528640.

The previous prime is 66203647577. The next prime is 66203647583. The reversal of 66203647580 is 8574630266.

It is an interprime number because it is at equal distance from previous prime (66203647577) and next prime (66203647583).

It is a super-4 number, since 4×66203647580⁴ (a number of 44 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66203647583) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 143608550 + ... + 143609010.

It is an arithmetic number, because the mean of its divisors is an integer number (875818944).

Almost surely, 2^66203647580 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 66203647580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84078618624).

66203647580 is an abundant number, since it is smaller than the sum of its proper divisors (101953589668).

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

66203647580 is a wasteful number, since it uses less digits than its factorization.

66203647580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1036 (or 1034 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 47.

The spelling of 66203647580 in words is "sixty-six billion, two hundred three million, six hundred forty-seven thousand, five hundred eighty".