61605603 has 32 divisors (see below), whose sum is σ = 97888320. Its totient is φ = 38631168.

The previous prime is 61605589. The next prime is 61605613. The reversal of 61605603 is 30650616.

61605603 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 61605603 - 2⁶ = 61605539 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61605613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 36351 + ... + 38007.

It is an arithmetic number, because the mean of its divisors is an integer number (3059010).

Almost surely, 2^61605603 is an apocalyptic number.

61605603 is a deficient number, since it is larger than the sum of its proper divisors (36282717).

61605603 is an equidigital number, since it uses as much as digits as its factorization.

61605603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1695 (or 1677 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 61605603 is about 7848.9236841748. The cubic root of 61605603 is about 394.9481382533.

The spelling of 61605603 in words is "sixty-one million, six hundred five thousand, six hundred three".