15555056655601 has 2 divisors, whose sum is σ = 15555056655602. Its totient is φ = 15555056655600.

The previous prime is 15555056655587. The next prime is 15555056655647. The reversal of 15555056655601 is 10655665055551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8783819990001 + 6771236665600 = 2963751^2 + 2602160^2 .

It is a cyclic number.

It is not a de Polignac number, because 15555056655601 - 2¹³ = 15555056647409 is a prime.

It is not a weakly prime, because it can be changed into another prime (15555056655701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7777528327800 + 7777528327801.

It is an arithmetic number, because the mean of its divisors is an integer number (7777528327801).

Almost surely, 2^{15555056655601} is an apocalyptic number.

It is an amenable number.

15555056655601 is a deficient number, since it is larger than the sum of its proper divisors (1).

15555056655601 is an equidigital number, since it uses as much as digits as its factorization.

15555056655601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16875000, while the sum is 55.

The spelling of 15555056655601 in words is "fifteen trillion, five hundred fifty-five billion, fifty-six million, six hundred fifty-five thousand, six hundred one".