5217161721157 has 8 divisors (see below), whose sum is σ = 5233116073752. Its totient is φ = 5201222016000.

The previous prime is 5217161721131. The next prime is 5217161721181. The reversal of 5217161721157 is 7511271617125.

It can be written as a sum of positive squares in 4 ways, for example, as 1054782404676 + 4162379316481 = 1027026^2 + 2040191^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 5217161721157 - 2¹⁹ = 5217161196869 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 (5217161721127) 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, 2948194 + ... + 4373347.

It is an arithmetic number, because the mean of its divisors is an integer number (654139509219).

Almost surely, 2^{5217161721157} is an apocalyptic number.

It is an amenable number.

5217161721157 is a deficient number, since it is larger than the sum of its proper divisors (15954352595).

5217161721157 is a wasteful number, since it uses less digits than its factorization.

5217161721157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7323719.

The product of its digits is 205800, while the sum is 46.

The spelling of 5217161721157 in words is "five trillion, two hundred seventeen billion, one hundred sixty-one million, seven hundred twenty-one thousand, one hundred fifty-seven".