12001107161657 has 4 divisors (see below), whose sum is σ = 12001155786276. Its totient is φ = 12001058537040.

The previous prime is 12001107161653. The next prime is 12001107161707. The reversal of 12001107161657 is 75616170110021.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10409424660496 + 1591682501161 = 3226364^2 + 1261619^2 .

It is a cyclic number.

It is not a de Polignac number, because 12001107161657 - 2² = 12001107161653 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12001107161657.

It is not an unprimeable number, because it can be changed into a prime (12001107161653) 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, 23940194 + ... + 24436347.

It is an arithmetic number, because the mean of its divisors is an integer number (3000288946569).

Almost surely, 2^{12001107161657} is an apocalyptic number.

It is an amenable number.

12001107161657 is a deficient number, since it is larger than the sum of its proper divisors (48624619).

12001107161657 is an equidigital number, since it uses as much as digits as its factorization.

12001107161657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48624618.

The product of its (nonzero) digits is 17640, while the sum is 38.

Adding to 12001107161657 its reverse (75616170110021), we get a palindrome (87617277271678).

The spelling of 12001107161657 in words is "twelve trillion, one billion, one hundred seven million, one hundred sixty-one thousand, six hundred fifty-seven".