161536783 has 4 divisors (see below), whose sum is σ = 165902680. Its totient is φ = 157170888.

The previous prime is 161536769. The next prime is 161536789. The reversal of 161536783 is 387635161.

It is a happy number.

161536783 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 387635161 = 1423 ⋅272407.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161536783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161536789) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2182893 + ... + 2182966.

It is an arithmetic number, because the mean of its divisors is an integer number (41475670).

Almost surely, 2^161536783 is an apocalyptic number.

161536783 is a deficient number, since it is larger than the sum of its proper divisors (4365897).

161536783 is an equidigital number, since it uses as much as digits as its factorization.

161536783 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4365896.

The product of its digits is 90720, while the sum is 40.

The square root of 161536783 is about 12709.7121525234. The cubic root of 161536783 is about 544.6161008812.

The spelling of 161536783 in words is "one hundred sixty-one million, five hundred thirty-six thousand, seven hundred eighty-three".