163557261351 has 48 divisors (see below), whose sum is σ = 266625055008. Its totient is φ = 95742259200.

The previous prime is 163557261323. The next prime is 163557261353. The reversal of 163557261351 is 153162755361.

163557261351 is a `hidden beast` number, since 1 + 6 + 3 + 557 + 2 + 61 + 35 + 1 = 666.

It is not a de Polignac number, because 163557261351 - 2¹³ = 163557253159 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 163557261297 and 163557261306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163557261353) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 338871 + ... + 664791.

It is an arithmetic number, because the mean of its divisors is an integer number (5554688646).

Almost surely, 2^163557261351 is an apocalyptic number.

163557261351 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

163557261351 is a deficient number, since it is larger than the sum of its proper divisors (103067793657).

163557261351 is a wasteful number, since it uses less digits than its factorization.

163557261351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326112 (or 326109 counting only the distinct ones).

The product of its digits is 567000, while the sum is 45.

The spelling of 163557261351 in words is "one hundred sixty-three billion, five hundred fifty-seven million, two hundred sixty-one thousand, three hundred fifty-one".