163611555503355 has 80 divisors (see below), whose sum is σ = 295311343536000. Its totient is φ = 86657981034240.

The previous prime is 163611555503329. The next prime is 163611555503399. The reversal of 163611555503355 is 553305555116361.

163611555503355 is a `hidden beast` number, since 1 + 6 + 3 + 6 + 1 + 1 + 5 + 5 + 550 + 33 + 55 = 666.

It is not a de Polignac number, because 163611555503355 - 2¹¹ = 163611555501307 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 332798425 + ... + 333289685.

It is an arithmetic number, because the mean of its divisors is an integer number (3691391794200).

Almost surely, 2^{163611555503355} is an apocalyptic number.

163611555503355 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

163611555503355 is a deficient number, since it is larger than the sum of its proper divisors (131699788032645).

163611555503355 is a wasteful number, since it uses less digits than its factorization.

163611555503355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 496946 (or 496937 counting only the distinct ones).

The product of its (nonzero) digits is 15187500, while the sum is 54.

The spelling of 163611555503355 in words is "one hundred sixty-three trillion, six hundred eleven billion, five hundred fifty-five million, five hundred three thousand, three hundred fifty-five".