61616745 has 24 divisors (see below), whose sum is σ = 108271176. Its totient is φ = 32410368.

The previous prime is 61616663. The next prime is 61616749. The reversal of 61616745 is 54761616.

61616745 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 9603801 + 52012944 = 3099^2 + 7212^2 .

It is not a de Polignac number, because 61616745 - 2¹⁹ = 61092457 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (61616749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6094 + ... + 12663.

It is an arithmetic number, because the mean of its divisors is an integer number (4511299).

Almost surely, 2^61616745 is an apocalyptic number.

It is an amenable number.

61616745 is a deficient number, since it is larger than the sum of its proper divisors (46654431).

61616745 is a wasteful number, since it uses less digits than its factorization.

61616745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18841 (or 18838 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 61616745 is about 7849.6334309317. The cubic root of 61616745 is about 394.9719469475.

The spelling of 61616745 in words is "sixty-one million, six hundred sixteen thousand, seven hundred forty-five".