66615201576 has 576 divisors, whose sum is σ = 245390745600. Its totient is φ = 16540951680.

The previous prime is 66615201563. The next prime is 66615201581. The reversal of 66615201576 is 67510251666.

It is a super-2 number, since 2×66615201576² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 37870185 + ... + 37871943.

It is an arithmetic number, because the mean of its divisors is an integer number (426025600).

Almost surely, 2^66615201576 is an apocalyptic number.

66615201576 is a gapful number since it is divisible by the number (66) 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 66615201576, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (122695372800).

66615201576 is an abundant number, since it is smaller than the sum of its proper divisors (178775544024).

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

66615201576 is a wasteful number, since it uses less digits than its factorization.

66615201576 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1832 (or 1805 counting only the distinct ones).

The product of its (nonzero) digits is 453600, while the sum is 45.

The spelling of 66615201576 in words is "sixty-six billion, six hundred fifteen million, two hundred one thousand, five hundred seventy-six".