1606040865 has 120 divisors (see below), whose sum is σ = 3409269864. Its totient is φ = 718502400.

The previous prime is 1606040861. The next prime is 1606040897. The reversal of 1606040865 is 5680406061.

1606040865 is a `hidden beast` number, since 1 + 606 + 0 + 40 + 8 + 6 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 99980001 + 1506060864 = 9999^2 + 38808^2 .

It is not a de Polignac number, because 1606040865 - 2² = 1606040861 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1606040861) by changing a digit.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 635805 + ... + 638325.

Almost surely, 2^1606040865 is an apocalyptic number.

1606040865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1606040865 is an abundant number, since it is smaller than the sum of its proper divisors (1803228999).

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

1606040865 is a wasteful number, since it uses less digits than its factorization.

1606040865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2573 (or 2553 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 1606040865 is about 40075.4396731964. The cubic root of 1606040865 is about 1171.0772130393.

The spelling of 1606040865 in words is "one billion, six hundred six million, forty thousand, eight hundred sixty-five".