52172320261 has 8 divisors (see below), whose sum is σ = 52587473400. Its totient is φ = 51758685888.

The previous prime is 52172320247. The next prime is 52172320301. The reversal of 52172320261 is 16202327125.

It can be written as a sum of positive squares in 4 ways, for example, as 45755349025 + 6416971236 = 213905^2 + 80106^2 .

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 52172320261 - 2³¹ = 50024836613 is a prime.

It is a super-2 number, since 2×52172320261² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52172320961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 310666 + ... + 448171.

It is an arithmetic number, because the mean of its divisors is an integer number (6573434175).

Almost surely, 2^52172320261 is an apocalyptic number.

It is an amenable number.

52172320261 is a deficient number, since it is larger than the sum of its proper divisors (415153139).

52172320261 is a wasteful number, since it uses less digits than its factorization.

52172320261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 759383.

The product of its (nonzero) digits is 10080, while the sum is 31.

Adding to 52172320261 its reverse (16202327125), we get a palindrome (68374647386).

The spelling of 52172320261 in words is "fifty-two billion, one hundred seventy-two million, three hundred twenty thousand, two hundred sixty-one".