66424721415 has 128 divisors (see below), whose sum is σ = 121405132800. Its totient is φ = 30778460160.

The previous prime is 66424721393. The next prime is 66424721453. The reversal of 66424721415 is 51412742466.

It is not a de Polignac number, because 66424721415 - 2⁹ = 66424720903 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 (19) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 130500181 + ... + 130500689.

It is an arithmetic number, because the mean of its divisors is an integer number (948477600).

Almost surely, 2^66424721415 is an apocalyptic number.

66424721415 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

66424721415 is a deficient number, since it is larger than the sum of its proper divisors (54980411385).

66424721415 is a wasteful number, since it uses less digits than its factorization.

66424721415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1097.

The product of its digits is 322560, while the sum is 42.

The spelling of 66424721415 in words is "sixty-six billion, four hundred twenty-four million, seven hundred twenty-one thousand, four hundred fifteen".