1606661406 has 40 divisors (see below), whose sum is σ = 4114416240. Its totient is φ = 459045792.

The previous prime is 1606661387. The next prime is 1606661431. The reversal of 1606661406 is 6041666061.

It is a congruent number.

It is an unprimeable number.

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 19 ways as a sum of consecutive naturals, for example, 707271 + ... + 709538.

It is an arithmetic number, because the mean of its divisors is an integer number (102860406).

Almost surely, 2^1606661406 is an apocalyptic number.

1606661406 is an abundant number, since it is smaller than the sum of its proper divisors (2507754834).

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

1606661406 is a wasteful number, since it uses less digits than its factorization.

1606661406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1416830 (or 1416821 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 1606661406 is about 40083.1810863359. The cubic root of 1606661406 is about 1171.2280202959.

The spelling of 1606661406 in words is "one billion, six hundred six million, six hundred sixty-one thousand, four hundred six".