163533870765 has 24 divisors (see below), whose sum is σ = 291119758488. Its totient is φ = 84860818560.

The previous prime is 163533870737. The next prime is 163533870779. The reversal of 163533870765 is 567078335361.

It can be written as a sum of positive squares in 4 ways, for example, as 25609280841 + 137924589924 = 160029^2 + 371382^2 .

It is not a de Polignac number, because 163533870765 - 2¹⁵ = 163533837997 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 49107606 + ... + 49110935.

It is an arithmetic number, because the mean of its divisors is an integer number (12129989937).

Almost surely, 2^163533870765 is an apocalyptic number.

163533870765 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

163533870765 is a deficient number, since it is larger than the sum of its proper divisors (127585887723).

163533870765 is a wasteful number, since it uses less digits than its factorization.

163533870765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98218589 (or 98218586 counting only the distinct ones).

The product of its (nonzero) digits is 9525600, while the sum is 54.

It can be divided in two parts, 1635 and 33870765, that added together give a square (33872400 = 5820²).

The spelling of 163533870765 in words is "one hundred sixty-three billion, five hundred thirty-three million, eight hundred seventy thousand, seven hundred sixty-five".