155561166063 has 20 divisors (see below), whose sum is σ = 232644774648. Its totient is φ = 103589947440.

The previous prime is 155561166037. The next prime is 155561166077. The reversal of 155561166063 is 360661165551.

155561166063 is a `hidden beast` number, since 15 + 5 + 561 + 16 + 6 + 0 + 63 = 666.

It is not a de Polignac number, because 155561166063 - 2²⁴ = 155544388847 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155561166023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1015968 + ... + 1159013.

Almost surely, 2^155561166063 is an apocalyptic number.

155561166063 is a deficient number, since it is larger than the sum of its proper divisors (77083608585).

155561166063 is an equidigital number, since it uses as much as digits as its factorization.

155561166063 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2175876 (or 2175867 counting only the distinct ones).

The product of its (nonzero) digits is 486000, while the sum is 45.

The spelling of 155561166063 in words is "one hundred fifty-five billion, five hundred sixty-one million, one hundred sixty-six thousand, sixty-three".