66511672700047 has 4 divisors (see below), whose sum is σ = 66538965141016. Its totient is φ = 66484380259080.

The previous prime is 66511672699991. The next prime is 66511672700059. The reversal of 66511672700047 is 74000727611566.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 66511672700047 - 2³¹ = 66509525216399 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66511672699967 and 66511672700003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66511672700087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13646216829 + ... + 13646221702.

It is an arithmetic number, because the mean of its divisors is an integer number (16634741285254).

Almost surely, 2^{66511672700047} is an apocalyptic number.

66511672700047 is a deficient number, since it is larger than the sum of its proper divisors (27292440969).

66511672700047 is a wasteful number, since it uses less digits than its factorization.

66511672700047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27292440968.

The product of its (nonzero) digits is 2963520, while the sum is 52.

The spelling of 66511672700047 in words is "sixty-six trillion, five hundred eleven billion, six hundred seventy-two million, seven hundred thousand, forty-seven".