165605606550 has 36 divisors (see below), whose sum is σ = 444927064140. Its totient is φ = 44161494960.

The previous prime is 165605606489. The next prime is 165605606563. The reversal of 165605606550 is 55606506561.

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

It is a junction number, because it is equal to n+sod(n) for n = 165605606496 and 165605606505.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 184005780 + ... + 184006679.

It is an arithmetic number, because the mean of its divisors is an integer number (12359085115).

Almost surely, 2^165605606550 is an apocalyptic number.

165605606550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

165605606550 is an abundant number, since it is smaller than the sum of its proper divisors (279321457590).

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

165605606550 is a wasteful number, since it uses less digits than its factorization.

165605606550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368012477 (or 368012469 counting only the distinct ones).

The product of its (nonzero) digits is 810000, while the sum is 45.

The spelling of 165605606550 in words is "one hundred sixty-five billion, six hundred five million, six hundred six thousand, five hundred fifty".