66195830697 has 4 divisors (see below), whose sum is σ = 88261107600. Its totient is φ = 44130553796.

The previous prime is 66195830677. The next prime is 66195830699. The reversal of 66195830697 is 79603859166.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66195830697 - 2²² = 66191636393 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66195830697.

It is not an unprimeable number, because it can be changed into a prime (66195830699) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11032638447 + ... + 11032638452.

It is an arithmetic number, because the mean of its divisors is an integer number (22065276900).

Almost surely, 2^66195830697 is an apocalyptic number.

It is an amenable number.

66195830697 is a deficient number, since it is larger than the sum of its proper divisors (22065276903).

66195830697 is a wasteful number, since it uses less digits than its factorization.

66195830697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22065276902.

The product of its (nonzero) digits is 14696640, while the sum is 60.

The spelling of 66195830697 in words is "sixty-six billion, one hundred ninety-five million, eight hundred thirty thousand, six hundred ninety-seven".