66959744542 has 4 divisors (see below), whose sum is σ = 100439616816. Its totient is φ = 33479872270.

The previous prime is 66959744513. The next prime is 66959744581. The reversal of 66959744542 is 24544795966.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16739936134 + ... + 16739936137.

It is an arithmetic number, because the mean of its divisors is an integer number (25109904204).

Almost surely, 2^66959744542 is an apocalyptic number.

66959744542 is a deficient number, since it is larger than the sum of its proper divisors (33479872274).

66959744542 is a wasteful number, since it uses less digits than its factorization.

66959744542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33479872273.

The product of its digits is 65318400, while the sum is 61.

The spelling of 66959744542 in words is "sixty-six billion, nine hundred fifty-nine million, seven hundred forty-four thousand, five hundred forty-two".