61147566725 has 18 divisors (see below), whose sum is σ = 88202246994. Its totient is φ = 41929759200.

The previous prime is 61147566721. The next prime is 61147566769. The reversal of 61147566725 is 52766574116.

It can be written as a sum of positive squares in 3 ways, for example, as 11593690276 + 49553876449 = 107674^2 + 222607^2 .

It is not a de Polignac number, because 61147566725 - 2² = 61147566721 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61147566721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 24956966 + ... + 24959415.

It is an arithmetic number, because the mean of its divisors is an integer number (4900124833).

Almost surely, 2^61147566725 is an apocalyptic number.

It is an amenable number.

61147566725 is a deficient number, since it is larger than the sum of its proper divisors (27054680269).

61147566725 is a wasteful number, since it uses less digits than its factorization.

61147566725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49916405 (or 49916393 counting only the distinct ones).

The product of its digits is 2116800, while the sum is 50.

The spelling of 61147566725 in words is "sixty-one billion, one hundred forty-seven million, five hundred sixty-six thousand, seven hundred twenty-five".