61603655 has 4 divisors (see below), whose sum is σ = 73924392. Its totient is φ = 49282920.

The previous prime is 61603601. The next prime is 61603657. The reversal of 61603655 is 55630616.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 61603655 - 2¹⁰ = 61602631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61603657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6160361 + ... + 6160370.

It is an arithmetic number, because the mean of its divisors is an integer number (18481098).

Almost surely, 2^61603655 is an apocalyptic number.

61603655 is a deficient number, since it is larger than the sum of its proper divisors (12320737).

61603655 is a wasteful number, since it uses less digits than its factorization.

61603655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12320736.

The product of its (nonzero) digits is 16200, while the sum is 32.

The square root of 61603655 is about 7848.7995897462. The cubic root of 61603655 is about 394.9439753902.

The spelling of 61603655 in words is "sixty-one million, six hundred three thousand, six hundred fifty-five".