1606556081 has 6 divisors (see below), whose sum is σ = 1739643750. Its totient is φ = 1482974688.

The previous prime is 1606556057. The next prime is 1606556093. The reversal of 1606556081 is 1806556061.

It can be written as a sum of positive squares in 3 ways, for example, as 23232400 + 1583323681 = 4820^2 + 39791^2 .

It is not a de Polignac number, because 1606556081 - 2¹⁰ = 1606555057 is a prime.

It is a super-2 number, since 2×1606556081² = 5162044882796157122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1606556681) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4752956 + ... + 4753293.

It is an arithmetic number, because the mean of its divisors is an integer number (289940625).

Almost surely, 2^1606556081 is an apocalyptic number.

It is an amenable number.

1606556081 is a deficient number, since it is larger than the sum of its proper divisors (133087669).

1606556081 is an equidigital number, since it uses as much as digits as its factorization.

1606556081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9506275 (or 9506262 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 38.

The square root of 1606556081 is about 40081.8672344490. The cubic root of 1606556081 is about 1171.2024263767.

The spelling of 1606556081 in words is "one billion, six hundred six million, five hundred fifty-six thousand, eighty-one".