66515566060500 has 192 divisors, whose sum is σ = 205674723072000. Its totient is φ = 16646266521600.

The previous prime is 66515566060487. The next prime is 66515566060501. The reversal of 66515566060500 is 506066551566.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66515566060501) 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, 5162461 + ... + 12636539.

It is an arithmetic number, because the mean of its divisors is an integer number (1071222516000).

Almost surely, 2^{66515566060500} is an apocalyptic number.

66515566060500 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 66515566060500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102837361536000).

66515566060500 is an abundant number, since it is smaller than the sum of its proper divisors (139159157011500).

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

66515566060500 is a wasteful number, since it uses less digits than its factorization.

66515566060500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7474467 (or 7474455 counting only the distinct ones).

The product of its (nonzero) digits is 4860000, while the sum is 51.

The spelling of 66515566060500 in words is "sixty-six trillion, five hundred fifteen billion, five hundred sixty-six million, sixty thousand, five hundred".