161322550 has 24 divisors (see below), whose sum is σ = 300418272. Its totient is φ = 64452000.

The previous prime is 161322547. The next prime is 161322587. The reversal of 161322550 is 55223161.

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 60240 + ... + 62860.

It is an arithmetic number, because the mean of its divisors is an integer number (12517428).

Almost surely, 2^161322550 is an apocalyptic number.

161322550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161322550 is a deficient number, since it is larger than the sum of its proper divisors (139095722).

161322550 is a wasteful number, since it uses less digits than its factorization.

161322550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3864 (or 3859 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 161322550 is about 12701.2814314147. The cubic root of 161322550 is about 544.3752344652.

The spelling of 161322550 in words is "one hundred sixty-one million, three hundred twenty-two thousand, five hundred fifty".