5161821542197 has 4 divisors (see below), whose sum is σ = 5169446094636. Its totient is φ = 5154196989760.

The previous prime is 5161821542161. The next prime is 5161821542239. The reversal of 5161821542197 is 7912451281615.

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 4986784738321 + 175036803876 = 2233111^2 + 418374^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5161821542197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5161821542107) 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, 3812275204 + ... + 3812276557.

It is an arithmetic number, because the mean of its divisors is an integer number (1292361523659).

Almost surely, 2^{5161821542197} is an apocalyptic number.

It is an amenable number.

5161821542197 is a deficient number, since it is larger than the sum of its proper divisors (7624552439).

5161821542197 is an equidigital number, since it uses as much as digits as its factorization.

5161821542197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7624552438.

The product of its digits is 1209600, while the sum is 52.

The spelling of 5161821542197 in words is "five trillion, one hundred sixty-one billion, eight hundred twenty-one million, five hundred forty-two thousand, one hundred ninety-seven".