1605655153 has 4 divisors (see below), whose sum is σ = 1611452020. Its totient is φ = 1599858288.

The previous prime is 1605655123. The next prime is 1605655157. The reversal of 1605655153 is 3515565061.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3515565061 = 43 ⋅81757327.

It can be written as a sum of positive squares in 2 ways, for example, as 96177249 + 1509477904 = 9807^2 + 38852^2 .

It is a cyclic number.

It is not a de Polignac number, because 1605655153 - 2²¹ = 1603558001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1605655157) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2898018 + ... + 2898571.

It is an arithmetic number, because the mean of its divisors is an integer number (402863005).

Almost surely, 2^1605655153 is an apocalyptic number.

It is an amenable number.

1605655153 is a deficient number, since it is larger than the sum of its proper divisors (5796867).

1605655153 is an equidigital number, since it uses as much as digits as its factorization.

1605655153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5796866.

The product of its (nonzero) digits is 67500, while the sum is 37.

The square root of 1605655153 is about 40070.6270602295. The cubic root of 1605655153 is about 1170.9834556285.

The spelling of 1605655153 in words is "one billion, six hundred five million, six hundred fifty-five thousand, one hundred fifty-three".