55131135626261 has 4 divisors (see below), whose sum is σ = 55132331757132. Its totient is φ = 55129939495392.

The previous prime is 55131135626257. The next prime is 55131135626269. The reversal of 55131135626261 is 16262653113155.

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 21484105659025 + 33647029967236 = 4635095^2 + 5800606^2 .

It is a cyclic number.

It is not a de Polignac number, because 55131135626261 - 2² = 55131135626257 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 (55131135626269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 597996296 + ... + 598088481.

It is an arithmetic number, because the mean of its divisors is an integer number (13783082939283).

Almost surely, 2^{55131135626261} is an apocalyptic number.

It is an amenable number.

55131135626261 is a deficient number, since it is larger than the sum of its proper divisors (1196130871).

55131135626261 is a wasteful number, since it uses less digits than its factorization.

55131135626261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1196130870.

The product of its digits is 972000, while the sum is 47.

The spelling of 55131135626261 in words is "fifty-five trillion, one hundred thirty-one billion, one hundred thirty-five million, six hundred twenty-six thousand, two hundred sixty-one".