161477565 has 16 divisors (see below), whose sum is σ = 260653248. Its totient is φ = 85358336.

The previous prime is 161477531. The next prime is 161477567. The reversal of 161477565 is 565774161.

It is a cyclic number.

It is not a de Polignac number, because 161477565 - 2⁹ = 161477053 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161477567) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45939 + ... + 49328.

It is an arithmetic number, because the mean of its divisors is an integer number (16290828).

Almost surely, 2^161477565 is an apocalyptic number.

161477565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161477565 is a deficient number, since it is larger than the sum of its proper divisors (99175683).

161477565 is a wasteful number, since it uses less digits than its factorization.

161477565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95388.

The product of its digits is 176400, while the sum is 42.

The square root of 161477565 is about 12707.3823032126. The cubic root of 161477565 is about 544.5495422158.

The spelling of 161477565 in words is "one hundred sixty-one million, four hundred seventy-seven thousand, five hundred sixty-five".