165383757733878 has 20 divisors (see below), whose sum is σ = 370582123811460. Its totient is φ = 55127919244572.

The previous prime is 165383757733849. The next prime is 165383757733903. The reversal of 165383757733878 is 878337757383561.

165383757733878 is a `hidden beast` number, since 1 + 6 + 5 + 3 + 8 + 3 + 7 + 577 + 3 + 38 + 7 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is a junction number, because it is equal to n+sod(n) for n = 165383757733797 and 165383757733806.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 510443696548 + ... + 510443696871.

It is an arithmetic number, because the mean of its divisors is an integer number (18529106190573).

Almost surely, 2^{165383757733878} is an apocalyptic number.

165383757733878 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

165383757733878 is an abundant number, since it is smaller than the sum of its proper divisors (205198366077582).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

165383757733878 is a wasteful number, since it uses less digits than its factorization.

165383757733878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1020887393433 (or 1020887393424 counting only the distinct ones).

The product of its digits is 14936140800, while the sum is 81.

The spelling of 165383757733878 in words is "one hundred sixty-five trillion, three hundred eighty-three billion, seven hundred fifty-seven million, seven hundred thirty-three thousand, eight hundred seventy-eight".