55551052621 has 2 divisors, whose sum is σ = 55551052622. Its totient is φ = 55551052620.

The previous prime is 55551052619. The next prime is 55551052681. The reversal of 55551052621 is 12625015555.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34369452100 + 21181600521 = 185390^2 + 145539^2 .

It is a cyclic number.

It is not a de Polignac number, because 55551052621 - 2¹ = 55551052619 is a prime.

It is a super-2 number, since 2×55551052621² (a number of 22 digits) contains 22 as substring.

Together with 55551052619, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55551052681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27775526310 + 27775526311.

It is an arithmetic number, because the mean of its divisors is an integer number (27775526311).

Almost surely, 2^55551052621 is an apocalyptic number.

It is an amenable number.

55551052621 is a deficient number, since it is larger than the sum of its proper divisors (1).

55551052621 is an equidigital number, since it uses as much as digits as its factorization.

55551052621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 75000, while the sum is 37.

The spelling of 55551052621 in words is "fifty-five billion, five hundred fifty-one million, fifty-two thousand, six hundred twenty-one".