61065550 has 48 divisors (see below), whose sum is σ = 139803552. Its totient is φ = 19324800.

The previous prime is 61065527. The next prime is 61065551. The reversal of 61065550 is 5556016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61065551) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2161 + ... + 11260.

It is an arithmetic number, because the mean of its divisors is an integer number (2912574).

Almost surely, 2^61065550 is an apocalyptic number.

61065550 is an abundant number, since it is smaller than the sum of its proper divisors (78738002).

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

61065550 is a wasteful number, since it uses less digits than its factorization.

61065550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13453 (or 13448 counting only the distinct ones).

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

The square root of 61065550 is about 7814.4449578969. Note that the first 3 decimals coincide. The cubic root of 61065550 is about 393.7906718716.

The spelling of 61065550 in words is "sixty-one million, sixty-five thousand, five hundred fifty".