61605505 has 32 divisors (see below), whose sum is σ = 84954240. Its totient is φ = 42508800.

The previous prime is 61605469. The next prime is 61605517. The reversal of 61605505 is 50550616.

It is not a de Polignac number, because 61605505 - 2⁹ = 61604993 is a prime.

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, 102205 + ... + 102805.

It is an arithmetic number, because the mean of its divisors is an integer number (2654820).

Almost surely, 2^61605505 is an apocalyptic number.

61605505 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

61605505 is a deficient number, since it is larger than the sum of its proper divisors (23348735).

61605505 is a wasteful number, since it uses less digits than its factorization.

61605505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 721.

The product of its (nonzero) digits is 4500, while the sum is 28.

The square root of 61605505 is about 7848.9174412781. The cubic root of 61605505 is about 394.9479288300.

The spelling of 61605505 in words is "sixty-one million, six hundred five thousand, five hundred five".