61553616 has 40 divisors (see below), whose sum is σ = 167385120. Its totient is φ = 19437696.

The previous prime is 61553599. The next prime is 61553623. The reversal of 61553616 is 61635516.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32835 + ... + 34658.

It is an arithmetic number, because the mean of its divisors is an integer number (4184628).

Almost surely, 2^61553616 is an apocalyptic number.

It is an amenable number.

61553616 is an abundant number, since it is smaller than the sum of its proper divisors (105831504).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61553616 is a wasteful number, since it uses less digits than its factorization.

61553616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67523 (or 67517 counting only the distinct ones).

The product of its digits is 16200, while the sum is 33.

The square root of 61553616 is about 7845.6112572571. The cubic root of 61553616 is about 394.8370122840.

The spelling of 61553616 in words is "sixty-one million, five hundred fifty-three thousand, six hundred sixteen".