66257255275197 has 8 divisors (see below), whose sum is σ = 100963436609856. Its totient is φ = 37861288728672.

The previous prime is 66257255275103. The next prime is 66257255275223. The reversal of 66257255275197 is 79157255275266.

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

It is not a de Polignac number, because 66257255275197 - 2³⁹ = 65707499461309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66257255275097) 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, 1577553697008 + ... + 1577553697049.

It is an arithmetic number, because the mean of its divisors is an integer number (12620429576232).

Almost surely, 2^{66257255275197} is an apocalyptic number.

It is an amenable number.

66257255275197 is a deficient number, since it is larger than the sum of its proper divisors (34706181334659).

66257255275197 is a wasteful number, since it uses less digits than its factorization.

66257255275197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3155107394067.

The product of its digits is 555660000, while the sum is 69.

Adding to 66257255275197 its sum of digits (69), we get a palindrome (66257255275266).

The spelling of 66257255275197 in words is "sixty-six trillion, two hundred fifty-seven billion, two hundred fifty-five million, two hundred seventy-five thousand, one hundred ninety-seven".