66361785667 has 16 divisors (see below), whose sum is σ = 73530676800. Its totient is φ = 59571274752.

The previous prime is 66361785647. The next prime is 66361785691. The reversal of 66361785667 is 76658716366.

It is a de Polignac number, because none of the positive numbers 2^k-66361785667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66361785647) 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, 106698 + ... + 379615.

It is an arithmetic number, because the mean of its divisors is an integer number (4595667300).

Almost surely, 2^66361785667 is an apocalyptic number.

66361785667 is a deficient number, since it is larger than the sum of its proper divisors (7168891133).

66361785667 is a wasteful number, since it uses less digits than its factorization.

66361785667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 486702.

The product of its digits is 45722880, while the sum is 61.

The spelling of 66361785667 in words is "sixty-six billion, three hundred sixty-one million, seven hundred eighty-five thousand, six hundred sixty-seven".