66506505611651 has 8 divisors (see below), whose sum is σ = 76405379672064. Its totient is φ = 56707117723080.

The previous prime is 66506505611641. The next prime is 66506505611671. The reversal of 66506505611651 is 15611650560566.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66506505611651 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66506505611593 and 66506505611602.

It is not an unprimeable number, because it can be changed into a prime (66506505611641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24871541525 + ... + 24871544198.

It is an arithmetic number, because the mean of its divisors is an integer number (9550672459008).

Almost surely, 2^{66506505611651} is an apocalyptic number.

66506505611651 is a deficient number, since it is larger than the sum of its proper divisors (9898874060413).

66506505611651 is a wasteful number, since it uses less digits than its factorization.

66506505611651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49743085921.

The product of its (nonzero) digits is 4860000, while the sum is 53.

The spelling of 66506505611651 in words is "sixty-six trillion, five hundred six billion, five hundred five million, six hundred eleven thousand, six hundred fifty-one".