161965545 has 64 divisors (see below), whose sum is σ = 323813376. Its totient is φ = 67415040.

The previous prime is 161965487. The next prime is 161965547. The reversal of 161965545 is 545569161.

It is not a de Polignac number, because 161965545 - 2⁷ = 161965417 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 161965497 and 161965506.

It is not an unprimeable number, because it can be changed into a prime (161965547) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 53872 + ... + 56798.

It is an arithmetic number, because the mean of its divisors is an integer number (5059584).

Almost surely, 2^161965545 is an apocalyptic number.

161965545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161965545 is a deficient number, since it is larger than the sum of its proper divisors (161847831).

161965545 is a wasteful number, since it uses less digits than its factorization.

161965545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2990.

The product of its digits is 162000, while the sum is 42.

The square root of 161965545 is about 12726.5684691515. The cubic root of 161965545 is about 545.0975276464.

The spelling of 161965545 in words is "one hundred sixty-one million, nine hundred sixty-five thousand, five hundred forty-five".