65561610 has 16 divisors (see below), whose sum is σ = 157347936. Its totient is φ = 17483088.

The previous prime is 65561603. The next prime is 65561611. The reversal of 65561610 is 1616556.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 2185387 = 65561610 / (6 + 5 + 5 + 6 + 1 + 6 + 1 + 0).

It is not an unprimeable number, because it can be changed into a prime (65561611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1092664 + ... + 1092723.

It is an arithmetic number, because the mean of its divisors is an integer number (9834246).

Almost surely, 2^65561610 is an apocalyptic number.

65561610 is an abundant number, since it is smaller than the sum of its proper divisors (91786326).

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

65561610 is a wasteful number, since it uses less digits than its factorization.

65561610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2185397.

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 65561610 is about 8097.0124119949. The cubic root of 65561610 is about 403.2272463439.

The spelling of 65561610 in words is "sixty-five million, five hundred sixty-one thousand, six hundred ten".