5251364432161 has 4 divisors (see below), whose sum is σ = 5379446491524. Its totient is φ = 5123282372800.

The previous prime is 5251364432131. The next prime is 5251364432177. The reversal of 5251364432161 is 1612344631525.

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 2117260716561 + 3134103715600 = 1455081^2 + 1770340^2 .

It is a cyclic number.

It is not a de Polignac number, because 5251364432161 - 2¹¹ = 5251364430113 is a prime.

It is a super-2 number, since 2×5251364432161² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5251364432131) 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, 64041029620 + ... + 64041029701.

It is an arithmetic number, because the mean of its divisors is an integer number (1344861622881).

Almost surely, 2^{5251364432161} is an apocalyptic number.

It is an amenable number.

5251364432161 is a deficient number, since it is larger than the sum of its proper divisors (128082059363).

5251364432161 is a wasteful number, since it uses less digits than its factorization.

5251364432161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128082059362.

The product of its digits is 518400, while the sum is 43.

The spelling of 5251364432161 in words is "five trillion, two hundred fifty-one billion, three hundred sixty-four million, four hundred thirty-two thousand, one hundred sixty-one".