66729432578 has 16 divisors (see below), whose sum is σ = 100331076384. Its totient is φ = 33285786240.

The previous prime is 66729432569. The next prime is 66729432613. The reversal of 66729432578 is 87523492766.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3542501 + ... + 3561287.

It is an arithmetic number, because the mean of its divisors is an integer number (6270692274).

Almost surely, 2^66729432578 is an apocalyptic number.

66729432578 is a deficient number, since it is larger than the sum of its proper divisors (33601643806).

66729432578 is a wasteful number, since it uses less digits than its factorization.

66729432578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22897.

The product of its digits is 30481920, while the sum is 59.

The spelling of 66729432578 in words is "sixty-six billion, seven hundred twenty-nine million, four hundred thirty-two thousand, five hundred seventy-eight".