161827765 has 8 divisors (see below), whose sum is σ = 211847328. Its totient is φ = 117692880.

The previous prime is 161827759. The next prime is 161827819. The reversal of 161827765 is 567728161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 161827765 - 2¹³ = 161819573 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1471107 + ... + 1471216.

It is an arithmetic number, because the mean of its divisors is an integer number (26480916).

Almost surely, 2^161827765 is an apocalyptic number.

It is an amenable number.

161827765 is a deficient number, since it is larger than the sum of its proper divisors (50019563).

161827765 is a wasteful number, since it uses less digits than its factorization.

161827765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2942339.

The product of its digits is 141120, while the sum is 43.

The square root of 161827765 is about 12721.1542322228. The cubic root of 161827765 is about 544.9429168954.

The spelling of 161827765 in words is "one hundred sixty-one million, eight hundred twenty-seven thousand, seven hundred sixty-five".