181696656 has 20 divisors (see below), whose sum is σ = 469383152. Its totient is φ = 60565536.

The previous prime is 181696649. The next prime is 181696657. The reversal of 181696656 is 656696181.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 3785347 = 181696656 / (1 + 8 + 1 + 6 + 9 + 6 + 6 + 5 + 6).

It is not an unprimeable number, because it can be changed into a prime (181696657) 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, 1892626 + ... + 1892721.

Almost surely, 2^181696656 is an apocalyptic number.

181696656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

181696656 is an abundant number, since it is smaller than the sum of its proper divisors (287686496).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

181696656 is a wasteful number, since it uses less digits than its factorization.

181696656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3785358 (or 3785352 counting only the distinct ones).

The product of its digits is 466560, while the sum is 48.

The square root of 181696656 is about 13479.4901980750. The cubic root of 181696656 is about 566.3900884824.

The spelling of 181696656 in words is "one hundred eighty-one million, six hundred ninety-six thousand, six hundred fifty-six".