55107582097621 has 2 divisors, whose sum is σ = 55107582097622. Its totient is φ = 55107582097620.

The previous prime is 55107582097597. The next prime is 55107582097637. The reversal of 55107582097621 is 12679028570155.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48328718956996 + 6778863140625 = 6951886^2 + 2603625^2 .

It is a cyclic number.

It is not a de Polignac number, because 55107582097621 - 2⁷ = 55107582097493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55107582097691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27553791048810 + 27553791048811.

It is an arithmetic number, because the mean of its divisors is an integer number (27553791048811).

Almost surely, 2^{55107582097621} is an apocalyptic number.

It is an amenable number.

55107582097621 is a deficient number, since it is larger than the sum of its proper divisors (1).

55107582097621 is an equidigital number, since it uses as much as digits as its factorization.

55107582097621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10584000, while the sum is 58.

The spelling of 55107582097621 in words is "fifty-five trillion, one hundred seven billion, five hundred eighty-two million, ninety-seven thousand, six hundred twenty-one".