66605152173845 has 32 divisors (see below), whose sum is σ = 83214976320000. Its totient is φ = 51115998447360.

The previous prime is 66605152173797. The next prime is 66605152173869. The reversal of 66605152173845 is 54837125150666.

It is not a de Polignac number, because 66605152173845 - 2²² = 66605147979541 is a prime.

It is a super-2 number, since 2×66605152173845² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18830360 + ... + 22086030.

It is an arithmetic number, because the mean of its divisors is an integer number (2600468010000).

Almost surely, 2^{66605152173845} is an apocalyptic number.

It is an amenable number.

66605152173845 is a deficient number, since it is larger than the sum of its proper divisors (16609824146155).

66605152173845 is a wasteful number, since it uses less digits than its factorization.

66605152173845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3256613.

The product of its (nonzero) digits is 36288000, while the sum is 59.

The spelling of 66605152173845 in words is "sixty-six trillion, six hundred five billion, one hundred fifty-two million, one hundred seventy-three thousand, eight hundred forty-five".