816542163 has 6 divisors (see below), whose sum is σ = 1179449804. Its totient is φ = 544361436.

The previous prime is 816542161. The next prime is 816542171. The reversal of 816542163 is 361245618.

It is a happy number.

It is not a de Polignac number, because 816542163 - 2¹ = 816542161 is a prime.

It is a super-2 number, since 2×816542163² = 1333482207913437138, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (816542161) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 45363445 + ... + 45363462.

Almost surely, 2^816542163 is an apocalyptic number.

816542163 is a deficient number, since it is larger than the sum of its proper divisors (362907641).

816542163 is a wasteful number, since it uses less digits than its factorization.

816542163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90726913 (or 90726910 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 816542163 is about 28575.2018890506. The cubic root of 816542163 is about 934.6726576762.

The spelling of 816542163 in words is "eight hundred sixteen million, five hundred forty-two thousand, one hundred sixty-three".