66615847518 has 16 divisors (see below), whose sum is σ = 145343667456. Its totient is φ = 20186620440.

The previous prime is 66615847511. The next prime is 66615847553. The reversal of 66615847518 is 81574851666.

It is a super-2 number, since 2×66615847518² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66615847511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 504665446 + ... + 504665577.

It is an arithmetic number, because the mean of its divisors is an integer number (9083979216).

Almost surely, 2^66615847518 is an apocalyptic number.

66615847518 is an abundant number, since it is smaller than the sum of its proper divisors (78727819938).

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

66615847518 is a wasteful number, since it uses less digits than its factorization.

66615847518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1009331039.

The product of its digits is 9676800, while the sum is 57.

The spelling of 66615847518 in words is "sixty-six billion, six hundred fifteen million, eight hundred forty-seven thousand, five hundred eighteen".