66261142737706 has 16 divisors (see below), whose sum is σ = 113994767177280. Its totient is φ = 28296573409440.

The previous prime is 66261142737589. The next prime is 66261142737719. The reversal of 66261142737706 is 60773724116266.

It is a happy number.

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, 8421595296 + ... + 8421603163.

It is an arithmetic number, because the mean of its divisors is an integer number (7124672948580).

Almost surely, 2^{66261142737706} is an apocalyptic number.

66261142737706 is a deficient number, since it is larger than the sum of its proper divisors (47733624439574).

66261142737706 is a wasteful number, since it uses less digits than its factorization.

66261142737706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16843198749.

The product of its (nonzero) digits is 21337344, while the sum is 58.

The spelling of 66261142737706 in words is "sixty-six trillion, two hundred sixty-one billion, one hundred forty-two million, seven hundred thirty-seven thousand, seven hundred six".