165561350 has 48 divisors (see below), whose sum is σ = 315381600. Its totient is φ = 64646400.

The previous prime is 165561343. The next prime is 165561353. The reversal of 165561350 is 53165561.

It is a super-2 number, since 2×165561350² = 54821121227645000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165561353) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 528794 + ... + 529106.

It is an arithmetic number, because the mean of its divisors is an integer number (6570450).

Almost surely, 2^165561350 is an apocalyptic number.

165561350 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

165561350 is a deficient number, since it is larger than the sum of its proper divisors (149820250).

165561350 is a wasteful number, since it uses less digits than its factorization.

165561350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 545 (or 540 counting only the distinct ones).

The product of its (nonzero) digits is 13500, while the sum is 32.

The square root of 165561350 is about 12867.0645447981. The cubic root of 165561350 is about 549.1019504251.

The spelling of 165561350 in words is "one hundred sixty-five million, five hundred sixty-one thousand, three hundred fifty".