153005661 has 12 divisors (see below), whose sum is σ = 234008892. Its totient is φ = 96003456.

The previous prime is 153005641. The next prime is 153005681. The reversal of 153005661 is 166500351.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (153005641) and next prime (153005681).

It can be written as a sum of positive squares in 2 ways, for example, as 132020100 + 20985561 = 11490^2 + 4581^2 .

It is not a de Polignac number, because 153005661 - 2²⁵ = 119451229 is a prime.

153005661 is a modest number, since divided by 5661 gives 153 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (153005621) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 499866 + ... + 500171.

It is an arithmetic number, because the mean of its divisors is an integer number (19500741).

Almost surely, 2^153005661 is an apocalyptic number.

It is an amenable number.

153005661 is a deficient number, since it is larger than the sum of its proper divisors (81003231).

153005661 is a wasteful number, since it uses less digits than its factorization.

153005661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1000060 (or 1000057 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 27.

The square root of 153005661 is about 12369.5457070985. The cubic root of 153005661 is about 534.8547205028.

The spelling of 153005661 in words is "one hundred fifty-three million, five thousand, six hundred sixty-one".