1606620993 has 16 divisors (see below), whose sum is σ = 2217400320. Its totient is φ = 1033917696.

The previous prime is 1606620971. The next prime is 1606621013. The reversal of 1606620993 is 3990266061.

It is not a de Polignac number, because 1606620993 - 2⁶ = 1606620929 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1606620913) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42888 + ... + 71081.

It is an arithmetic number, because the mean of its divisors is an integer number (138587520).

Almost surely, 2^1606620993 is an apocalyptic number.

It is an amenable number.

1606620993 is a deficient number, since it is larger than the sum of its proper divisors (610779327).

1606620993 is a wasteful number, since it uses less digits than its factorization.

1606620993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114136.

The product of its (nonzero) digits is 104976, while the sum is 42.

The square root of 1606620993 is about 40082.6769689850. The cubic root of 1606620993 is about 1171.2182000906.

The spelling of 1606620993 in words is "one billion, six hundred six million, six hundred twenty thousand, nine hundred ninety-three".