66015005615 has 32 divisors (see below), whose sum is σ = 85957260480. Its totient is φ = 48669598848.

The previous prime is 66015005569. The next prime is 66015005629. The reversal of 66015005615 is 51650051066.

It is not a de Polignac number, because 66015005615 - 2²² = 66010811311 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7168604 + ... + 7177806.

It is an arithmetic number, because the mean of its divisors is an integer number (2686164390).

Almost surely, 2^66015005615 is an apocalyptic number.

66015005615 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

66015005615 is a deficient number, since it is larger than the sum of its proper divisors (19942254865).

66015005615 is an equidigital number, since it uses as much as digits as its factorization.

66015005615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9900 (or 9874 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 35.

The spelling of 66015005615 in words is "sixty-six billion, fifteen million, five thousand, six hundred fifteen".