816166154 has 4 divisors (see below), whose sum is σ = 1224249234. Its totient is φ = 408083076.

The previous prime is 816166103. The next prime is 816166157. The reversal of 816166154 is 451661618.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 507285529 + 308880625 = 22523^2 + 17575^2 .

It is a super-2 number, since 2×816166154² = 1332254381870303432, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (816166157) 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 as a sum of consecutive naturals, namely, 204041537 + ... + 204041540.

Almost surely, 2^816166154 is an apocalyptic number.

816166154 is a deficient number, since it is larger than the sum of its proper divisors (408083080).

816166154 is a wasteful number, since it uses less digits than its factorization.

816166154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408083079.

The product of its digits is 34560, while the sum is 38.

The square root of 816166154 is about 28568.6218428541. The cubic root of 816166154 is about 934.5291667022.

The spelling of 816166154 in words is "eight hundred sixteen million, one hundred sixty-six thousand, one hundred fifty-four".