1656621606 has 8 divisors (see below), whose sum is σ = 3313243224. Its totient is φ = 552207200.

The previous prime is 1656621541. The next prime is 1656621613. The reversal of 1656621606 is 6061266561.

It is a sphenic number, since it is the product of 3 distinct primes.

1656621606 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138051795 + ... + 138051806.

It is an arithmetic number, because the mean of its divisors is an integer number (414155403).

Almost surely, 2^1656621606 is an apocalyptic number.

1656621606 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1656621606 is a wasteful number, since it uses less digits than its factorization.

1656621606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276103606.

The product of its (nonzero) digits is 77760, while the sum is 39.

The square root of 1656621606 is about 40701.6167492153. The cubic root of 1656621606 is about 1183.2443527794.

The spelling of 1656621606 in words is "one billion, six hundred fifty-six million, six hundred twenty-one thousand, six hundred six".