61516353425 has 12 divisors (see below), whose sum is σ = 80767353996. Its totient is φ = 46318195200.

The previous prime is 61516353421. The next prime is 61516353433. The reversal of 61516353425 is 52435361516.

It can be written as a sum of positive squares in 6 ways, for example, as 689010001 + 60827343424 = 26249^2 + 246632^2 .

It is not a de Polignac number, because 61516353425 - 2² = 61516353421 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (61516353421) 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, 72371756 + ... + 72372605.

It is an arithmetic number, because the mean of its divisors is an integer number (6730612833).

Almost surely, 2^61516353425 is an apocalyptic number.

It is an amenable number.

61516353425 is a deficient number, since it is larger than the sum of its proper divisors (19251000571).

61516353425 is a wasteful number, since it uses less digits than its factorization.

61516353425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144744388 (or 144744383 counting only the distinct ones).

The product of its digits is 324000, while the sum is 41.

The spelling of 61516353425 in words is "sixty-one billion, five hundred sixteen million, three hundred fifty-three thousand, four hundred twenty-five".