61808740225 has 12 divisors (see below), whose sum is σ = 77401681020. Its totient is φ = 48957416000.

The previous prime is 61808740223. The next prime is 61808740333. The reversal of 61808740225 is 52204780816.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 1079516736 + 60729223489 = 32856^2 + 246433^2 .

It is not a de Polignac number, because 61808740225 - 2¹ = 61808740223 is a prime.

It is a super-3 number, since 3×61808740225³ (a number of 33 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (61808740223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12236830 + ... + 12241879.

It is an arithmetic number, because the mean of its divisors is an integer number (6450140085).

Almost surely, 2^61808740225 is an apocalyptic number.

It is an amenable number.

61808740225 is a deficient number, since it is larger than the sum of its proper divisors (15592940795).

61808740225 is a wasteful number, since it uses less digits than its factorization.

61808740225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24478820 (or 24478815 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 43.

The spelling of 61808740225 in words is "sixty-one billion, eight hundred eight million, seven hundred forty thousand, two hundred twenty-five".