161356263255 has 96 divisors (see below), whose sum is σ = 309628800000. Its totient is φ = 77078926080.

The previous prime is 161356263253. The next prime is 161356263259. The reversal of 161356263255 is 552362653161.

161356263255 is a `hidden beast` number, since 1 + 6 + 1 + 3 + 5 + 6 + 2 + 632 + 5 + 5 = 666.

It is not a de Polignac number, because 161356263255 - 2¹ = 161356263253 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 161356263255.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161356263253) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 19509261 + ... + 19517529.

It is an arithmetic number, because the mean of its divisors is an integer number (3225300000).

Almost surely, 2^161356263255 is an apocalyptic number.

161356263255 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

161356263255 is a deficient number, since it is larger than the sum of its proper divisors (148272536745).

161356263255 is a wasteful number, since it uses less digits than its factorization.

161356263255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8869 (or 8866 counting only the distinct ones).

The product of its digits is 972000, while the sum is 45.

The spelling of 161356263255 in words is "one hundred sixty-one billion, three hundred fifty-six million, two hundred sixty-three thousand, two hundred fifty-five".