55371836621 has 2 divisors, whose sum is σ = 55371836622. Its totient is φ = 55371836620.

The previous prime is 55371836599. The next prime is 55371836687. The reversal of 55371836621 is 12663817355.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39041808100 + 16330028521 = 197590^2 + 127789^2 .

It is a cyclic number.

It is not a de Polignac number, because 55371836621 - 2¹⁸ = 55371574477 is a prime.

It is a super-3 number, since 3×55371836621³ (a number of 33 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55371836521) 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 as a sum of consecutive naturals, namely, 27685918310 + 27685918311.

It is an arithmetic number, because the mean of its divisors is an integer number (27685918311).

Almost surely, 2^55371836621 is an apocalyptic number.

It is an amenable number.

55371836621 is a deficient number, since it is larger than the sum of its proper divisors (1).

55371836621 is an equidigital number, since it uses as much as digits as its factorization.

55371836621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 907200, while the sum is 47.

The spelling of 55371836621 in words is "fifty-five billion, three hundred seventy-one million, eight hundred thirty-six thousand, six hundred twenty-one".