20163144555 has 48 divisors (see below), whose sum is σ = 35376010176. Its totient is φ = 10622949120.

The previous prime is 20163144539. The next prime is 20163144581. The reversal of 20163144555 is 55544136102.

20163144555 is a `hidden beast` number, since 2 + 0 + 1 + 63 + 1 + 44 + 555 = 666.

It is not a de Polignac number, because 20163144555 - 2⁴ = 20163144539 is a prime.

It is a super-2 number, since 2×20163144555² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1946169 + ... + 1956501.

It is an arithmetic number, because the mean of its divisors is an integer number (737000212).

Almost surely, 2^20163144555 is an apocalyptic number.

20163144555 is a deficient number, since it is larger than the sum of its proper divisors (15212865621).

20163144555 is a wasteful number, since it uses less digits than its factorization.

20163144555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10868 (or 10865 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

The spelling of 20163144555 in words is "twenty billion, one hundred sixty-three million, one hundred forty-four thousand, five hundred fifty-five".