61755551225 has 6 divisors (see below), whose sum is σ = 76576883550. Its totient is φ = 49404440960.

The previous prime is 61755551203. The next prime is 61755551227. The reversal of 61755551225 is 52215555716.

It can be written as a sum of positive squares in 3 ways, for example, as 1182465769 + 60573085456 = 34387^2 + 246116^2 .

It is not a de Polignac number, because 61755551225 - 2¹⁸ = 61755289081 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61755551227) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1235111000 + ... + 1235111049.

It is an arithmetic number, because the mean of its divisors is an integer number (12762813925).

Almost surely, 2^61755551225 is an apocalyptic number.

It is an amenable number.

61755551225 is a deficient number, since it is larger than the sum of its proper divisors (14821332325).

61755551225 is a wasteful number, since it uses less digits than its factorization.

61755551225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2470222059 (or 2470222054 counting only the distinct ones).

The product of its digits is 525000, while the sum is 44.

The spelling of 61755551225 in words is "sixty-one billion, seven hundred fifty-five million, five hundred fifty-one thousand, two hundred twenty-five".