1606425621 has 8 divisors (see below), whose sum is σ = 2158251744. Its totient is φ = 1062774960.

The previous prime is 1606425617. The next prime is 1606425629. The reversal of 1606425621 is 1265246061.

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

It is not a de Polignac number, because 1606425621 - 2² = 1606425617 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1606425629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2043406 + ... + 2044191.

It is an arithmetic number, because the mean of its divisors is an integer number (269781468).

Almost surely, 2^1606425621 is an apocalyptic number.

It is an amenable number.

1606425621 is a deficient number, since it is larger than the sum of its proper divisors (551826123).

1606425621 is a wasteful number, since it uses less digits than its factorization.

1606425621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4087731.

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 1606425621 is about 40080.2397822169. The cubic root of 1606425621 is about 1171.1707231148.

The spelling of 1606425621 in words is "one billion, six hundred six million, four hundred twenty-five thousand, six hundred twenty-one".