15505545663601 has 16 divisors (see below), whose sum is σ = 18725149900800. Its totient is φ = 12551702022288.

The previous prime is 15505545663593. The next prime is 15505545663637. The reversal of 15505545663601 is 10636654550551.

It is a cyclic number.

It is not a de Polignac number, because 15505545663601 - 2³ = 15505545663593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15505545613601) 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 15 ways as a sum of consecutive naturals, for example, 609529921 + ... + 609555358.

It is an arithmetic number, because the mean of its divisors is an integer number (1170321868800).

Almost surely, 2^{15505545663601} is an apocalyptic number.

It is an amenable number.

15505545663601 is a deficient number, since it is larger than the sum of its proper divisors (3219604237199).

15505545663601 is a wasteful number, since it uses less digits than its factorization.

15505545663601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1219085388.

The product of its (nonzero) digits is 8100000, while the sum is 52.

The spelling of 15505545663601 in words is "fifteen trillion, five hundred five billion, five hundred forty-five million, six hundred sixty-three thousand, six hundred one".