66129693554 has 16 divisors (see below), whose sum is σ = 99512192736. Its totient is φ = 32959080000.

The previous prime is 66129693529. The next prime is 66129693559. The reversal of 66129693554 is 45539692166.

It is a self number, because there is not a number n which added to its sum of digits gives 66129693554.

It is not an unprimeable number, because it can be changed into a prime (66129693559) 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, 1135289 + ... + 1192115.

It is an arithmetic number, because the mean of its divisors is an integer number (6219512046).

Almost surely, 2^66129693554 is an apocalyptic number.

66129693554 is a deficient number, since it is larger than the sum of its proper divisors (33382499182).

66129693554 is a wasteful number, since it uses less digits than its factorization.

66129693554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58681.

The product of its digits is 10497600, while the sum is 56.

The spelling of 66129693554 in words is "sixty-six billion, one hundred twenty-nine million, six hundred ninety-three thousand, five hundred fifty-four".