52918861681 has 27 divisors (see below), whose sum is σ = 62732352459. Its totient is φ = 44510173008.

The previous prime is 52918861603. The next prime is 52918861691. The reversal of 52918861681 is 18616881925.

The square root of 52918861681 is 230041.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 4643741025 + 48275120656 = 68145^2 + 219716^2 .

It is not a de Polignac number, because 52918861681 - 2¹³ = 52918853489 is a prime.

It is a super-2 number, since 2×52918861681² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (52918861691) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 95006655 + ... + 95007211.

Almost surely, 2^52918861681 is an apocalyptic number.

52918861681 is the 230041-st square number.

52918861681 is the 115021-st centered octagonal number.

It is an amenable number.

52918861681 is a deficient number, since it is larger than the sum of its proper divisors (9813490778).

52918861681 is an frugal number, since it uses more digits than its factorization.

52918861681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1246 (or 623 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 55.

The spelling of 52918861681 in words is "fifty-two billion, nine hundred eighteen million, eight hundred sixty-one thousand, six hundred eighty-one".