165633803505 has 32 divisors (see below), whose sum is σ = 296609472000. Its totient is φ = 87693215616.

The previous prime is 165633803497. The next prime is 165633803557. The reversal of 165633803505 is 505308336561.

It is a happy number.

165633803505 is a `hidden beast` number, since 1 + 6 + 5 + 63 + 3 + 80 + 3 + 505 = 666.

It is not a de Polignac number, because 165633803505 - 2³ = 165633803497 is a prime.

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

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4459305 + ... + 4496294.

It is an arithmetic number, because the mean of its divisors is an integer number (9269046000).

Almost surely, 2^165633803505 is an apocalyptic number.

165633803505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

165633803505 is a deficient number, since it is larger than the sum of its proper divisors (130975668495).

165633803505 is a wasteful number, since it uses less digits than its factorization.

165633803505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8955750 (or 8955744 counting only the distinct ones).

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

The spelling of 165633803505 in words is "one hundred sixty-five billion, six hundred thirty-three million, eight hundred three thousand, five hundred five".