1806691656 has 384 divisors, whose sum is σ = 6079610880. Its totient is φ = 437184000.

The previous prime is 1806691637. The next prime is 1806691657. The reversal of 1806691656 is 6561966081.

It is not an unprimeable number, because it can be changed into a prime (1806691657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 29617866 + ... + 29617926.

It is an arithmetic number, because the mean of its divisors is an integer number (15832320).

Almost surely, 2^1806691656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1806691656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3039805440).

1806691656 is an abundant number, since it is smaller than the sum of its proper divisors (4272919224).

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

1806691656 is a wasteful number, since it uses less digits than its factorization.

1806691656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177 (or 162 counting only the distinct ones).

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

The square root of 1806691656 is about 42505.1956353573. The cubic root of 1806691656 is about 1217.9459425266.

The spelling of 1806691656 in words is "one billion, eight hundred six million, six hundred ninety-one thousand, six hundred fifty-six".