649433275161 has 16 divisors (see below), whose sum is σ = 945929607168. Its totient is φ = 393054512400.

The previous prime is 649433275157. The next prime is 649433275181. The reversal of 649433275161 is 161572334946.

It is not a de Polignac number, because 649433275161 - 2² = 649433275157 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (649433275181) 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, 13510945 + ... + 13558926.

It is an arithmetic number, because the mean of its divisors is an integer number (59120600448).

Almost surely, 2^649433275161 is an apocalyptic number.

It is an amenable number.

649433275161 is a deficient number, since it is larger than the sum of its proper divisors (296496332007).

649433275161 is a wasteful number, since it uses less digits than its factorization.

649433275161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27070612.

The product of its digits is 3265920, while the sum is 51.

The spelling of 649433275161 in words is "six hundred forty-nine billion, four hundred thirty-three million, two hundred seventy-five thousand, one hundred sixty-one".