66738791542 has 8 divisors (see below), whose sum is σ = 100123290576. Its totient is φ = 33364361352.

The previous prime is 66738791479. The next prime is 66738791543. The reversal of 66738791542 is 24519783766.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66738791543) 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 3 ways as a sum of consecutive naturals, for example, 2500618 + ... + 2527165.

It is an arithmetic number, because the mean of its divisors is an integer number (12515411322).

Almost surely, 2^66738791542 is an apocalyptic number.

66738791542 is a deficient number, since it is larger than the sum of its proper divisors (33384499034).

66738791542 is a wasteful number, since it uses less digits than its factorization.

66738791542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5034422.

The product of its digits is 15240960, while the sum is 58.

The spelling of 66738791542 in words is "sixty-six billion, seven hundred thirty-eight million, seven hundred ninety-one thousand, five hundred forty-two".