15505564385963 has 2 divisors, whose sum is σ = 15505564385964. Its totient is φ = 15505564385962.

The previous prime is 15505564385911. The next prime is 15505564386017. The reversal of 15505564385963 is 36958346550551.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 15505564385963 - 2²² = 15505560191659 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 15505564385963.

It is not a weakly prime, because it can be changed into another prime (15505564382963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7752782192981 + 7752782192982.

It is an arithmetic number, because the mean of its divisors is an integer number (7752782192982).

Almost surely, 2^{15505564385963} is an apocalyptic number.

15505564385963 is a deficient number, since it is larger than the sum of its proper divisors (1).

15505564385963 is an equidigital number, since it uses as much as digits as its factorization.

15505564385963 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 291600000, while the sum is 65.

The spelling of 15505564385963 in words is "fifteen trillion, five hundred five billion, five hundred sixty-four million, three hundred eighty-five thousand, nine hundred sixty-three".