66651750320467 has 16 divisors (see below), whose sum is σ = 71854331447808. Its totient is φ = 61459989413760.

The previous prime is 66651750320431. The next prime is 66651750320471. The reversal of 66651750320467 is 76402305715666.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66651750320467 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66651750320167) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50851113 + ... + 52145365.

It is an arithmetic number, because the mean of its divisors is an integer number (4490895715488).

Almost surely, 2^{66651750320467} is an apocalyptic number.

66651750320467 is a deficient number, since it is larger than the sum of its proper divisors (5202581127341).

66651750320467 is a wasteful number, since it uses less digits than its factorization.

66651750320467 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1298430.

The product of its (nonzero) digits is 38102400, while the sum is 58.

The spelling of 66651750320467 in words is "sixty-six trillion, six hundred fifty-one billion, seven hundred fifty million, three hundred twenty thousand, four hundred sixty-seven".