161864847 has 12 divisors (see below), whose sum is σ = 234837720. Its totient is φ = 107433168.

The previous prime is 161864783. The next prime is 161864849. The reversal of 161864847 is 748468161.

161864847 is a `hidden beast` number, since 161 + 8 + 6 + 484 + 7 = 666.

It is not a de Polignac number, because 161864847 - 2⁶ = 161864783 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161864849) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37572 + ... + 41657.

It is an arithmetic number, because the mean of its divisors is an integer number (19569810).

Almost surely, 2^161864847 is an apocalyptic number.

161864847 is a deficient number, since it is larger than the sum of its proper divisors (72972873).

161864847 is a wasteful number, since it uses less digits than its factorization.

161864847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79462 (or 79459 counting only the distinct ones).

The product of its digits is 258048, while the sum is 45.

The square root of 161864847 is about 12722.6116422691. The cubic root of 161864847 is about 544.9845373387.

The spelling of 161864847 in words is "one hundred sixty-one million, eight hundred sixty-four thousand, eight hundred forty-seven".