161776563 has 16 divisors (see below), whose sum is σ = 234356640. Its totient is φ = 98671104.

The previous prime is 161776547. The next prime is 161776567. The reversal of 161776563 is 365677161.

It is not a de Polignac number, because 161776563 - 2⁴ = 161776547 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161776567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13948 + ... + 22761.

It is an arithmetic number, because the mean of its divisors is an integer number (14647290).

Almost surely, 2^161776563 is an apocalyptic number.

161776563 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

161776563 is a deficient number, since it is larger than the sum of its proper divisors (72580077).

161776563 is a wasteful number, since it uses less digits than its factorization.

161776563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36838.

The product of its digits is 158760, while the sum is 42.

The square root of 161776563 is about 12719.1415983941. The cubic root of 161776563 is about 544.8854378621.

The spelling of 161776563 in words is "one hundred sixty-one million, seven hundred seventy-six thousand, five hundred sixty-three".