66501620050017 has 8 divisors (see below), whose sum is σ = 88673832665824. Its totient is φ = 44331910400448.

The previous prime is 66501620049973. The next prime is 66501620050043. The reversal of 66501620050017 is 71005002610566.

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

It is not a de Polignac number, because 66501620050017 - 2¹⁹ = 66501619525729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66501620040017) 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, 625679563 + ... + 625785840.

It is an arithmetic number, because the mean of its divisors is an integer number (11084229083228).

Almost surely, 2^{66501620050017} is an apocalyptic number.

It is an amenable number.

66501620050017 is a deficient number, since it is larger than the sum of its proper divisors (22172212615807).

66501620050017 is a wasteful number, since it uses less digits than its factorization.

66501620050017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1251483119.

The product of its (nonzero) digits is 75600, while the sum is 39.

The spelling of 66501620050017 in words is "sixty-six trillion, five hundred one billion, six hundred twenty million, fifty thousand, seventeen".