61550660 has 12 divisors (see below), whose sum is σ = 129256428. Its totient is φ = 24620256.

The previous prime is 61550653. The next prime is 61550663. The reversal of 61550660 is 6605516.

It can be written as a sum of positive squares in 2 ways, for example, as 15555136 + 45995524 = 3944^2 + 6782^2 .

It is not an unprimeable number, because it can be changed into a prime (61550663) 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 3 ways as a sum of consecutive naturals, for example, 1538747 + ... + 1538786.

It is an arithmetic number, because the mean of its divisors is an integer number (10771369).

Almost surely, 2^61550660 is an apocalyptic number.

It is an amenable number.

61550660 is an abundant number, since it is smaller than the sum of its proper divisors (67705768).

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

61550660 is a wasteful number, since it uses less digits than its factorization.

61550660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3077542 (or 3077540 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 61550660 is about 7845.4228694188. The cubic root of 61550660 is about 394.8306917406.

The spelling of 61550660 in words is "sixty-one million, five hundred fifty thousand, six hundred sixty".