66429391915 has 16 divisors (see below), whose sum is σ = 84374428320. Its totient is φ = 50068316160.

The previous prime is 66429391883. The next prime is 66429391939. The reversal of 66429391915 is 51919392466.

It is not a de Polignac number, because 66429391915 - 2⁵ = 66429391883 is a prime.

It is a super-2 number, since 2×66429391915² (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 15 ways as a sum of consecutive naturals, for example, 1914454 + ... + 1948843.

It is an arithmetic number, because the mean of its divisors is an integer number (5273401770).

Almost surely, 2^66429391915 is an apocalyptic number.

66429391915 is a deficient number, since it is larger than the sum of its proper divisors (17945036405).

66429391915 is a wasteful number, since it uses less digits than its factorization.

66429391915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3863502.

The product of its digits is 3149280, while the sum is 55.

The spelling of 66429391915 in words is "sixty-six billion, four hundred twenty-nine million, three hundred ninety-one thousand, nine hundred fifteen".