66605238208677 has 16 divisors (see below), whose sum is σ = 101496146048640. Its totient is φ = 38059217470272.

The previous prime is 66605238208673. The next prime is 66605238208681. The reversal of 66605238208677 is 77680283250666.

It is an interprime number because it is at equal distance from previous prime (66605238208673) and next prime (66605238208681).

It is not a de Polignac number, because 66605238208677 - 2² = 66605238208673 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66605238208673) 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, 37385802 + ... + 39126827.

It is an arithmetic number, because the mean of its divisors is an integer number (6343509128040).

Almost surely, 2^{66605238208677} is an apocalyptic number.

It is an amenable number.

66605238208677 is a deficient number, since it is larger than the sum of its proper divisors (34890907839963).

66605238208677 is a wasteful number, since it uses less digits than its factorization.

66605238208677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76554092.

The product of its (nonzero) digits is 243855360, while the sum is 66.

The spelling of 66605238208677 in words is "sixty-six trillion, six hundred five billion, two hundred thirty-eight million, two hundred eight thousand, six hundred seventy-seven".