1606634565 has 32 divisors (see below), whose sum is σ = 2608830720. Its totient is φ = 844225536.

The previous prime is 1606634543. The next prime is 1606634581. The reversal of 1606634565 is 5654366061.

It is not a de Polignac number, because 1606634565 - 2⁶ = 1606634501 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 290496 + ... + 295974.

It is an arithmetic number, because the mean of its divisors is an integer number (81525960).

Almost surely, 2^1606634565 is an apocalyptic number.

1606634565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1606634565 is a deficient number, since it is larger than the sum of its proper divisors (1002196155).

1606634565 is a wasteful number, since it uses less digits than its factorization.

1606634565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5773.

The product of its (nonzero) digits is 388800, while the sum is 42.

The square root of 1606634565 is about 40082.8462686970. The cubic root of 1606634565 is about 1171.2214980533.

The spelling of 1606634565 in words is "one billion, six hundred six million, six hundred thirty-four thousand, five hundred sixty-five".