61531047525 has 12 divisors (see below), whose sum is σ = 101731332032. Its totient is φ = 32816558640.

The previous prime is 61531047521. The next prime is 61531047527. The reversal of 61531047525 is 52574013516.

It is not a de Polignac number, because 61531047525 - 2² = 61531047521 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 (61531047521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 410206909 + ... + 410207058.

Almost surely, 2^61531047525 is an apocalyptic number.

It is an amenable number.

61531047525 is a deficient number, since it is larger than the sum of its proper divisors (40200284507).

61531047525 is a wasteful number, since it uses less digits than its factorization.

61531047525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 820413980 (or 820413975 counting only the distinct ones).

The product of its (nonzero) digits is 126000, while the sum is 39.

The spelling of 61531047525 in words is "sixty-one billion, five hundred thirty-one million, forty-seven thousand, five hundred twenty-five".