55479562681 has 3 divisors (see below), whose sum is σ = 55479798223. Its totient is φ = 55479327140.

The previous prime is 55479562673. The next prime is 55479562709. The reversal of 55479562681 is 18626597455.

It is a happy number.

The square root of 55479562681 is 235541.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 42542775081 + 12936787600 = 206259^2 + 113740^2 .

It is not a de Polignac number, because 55479562681 - 2³ = 55479562673 is a prime.

It is a super-2 number, since 2×55479562681² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55479562081) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 117771 + ... + 353311.

Almost surely, 2^55479562681 is an apocalyptic number.

55479562681 is the 235541-st square number.

55479562681 is the 117771-st centered octagonal number.

It is an amenable number.

55479562681 is a deficient number, since it is larger than the sum of its proper divisors (235542).

55479562681 is an frugal number, since it uses more digits than its factorization.

55479562681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471082 (or 235541 counting only the distinct ones).

The product of its digits is 18144000, while the sum is 58.

The spelling of 55479562681 in words is "fifty-five billion, four hundred seventy-nine million, five hundred sixty-two thousand, six hundred eighty-one".