61664513663225 has 24 divisors (see below), whose sum is σ = 83417094157728. Its totient is φ = 44845937971200.

The previous prime is 61664513663183. The next prime is 61664513663239. The reversal of 61664513663225 is 52236631546616.

61664513663225 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-61664513663225 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10260857 + ... + 15119993.

It is an arithmetic number, because the mean of its divisors is an integer number (3475712256572).

Almost surely, 2^{61664513663225} is an apocalyptic number.

It is an amenable number.

61664513663225 is a deficient number, since it is larger than the sum of its proper divisors (21752580494503).

61664513663225 is a wasteful number, since it uses less digits than its factorization.

61664513663225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4905305 (or 4905300 counting only the distinct ones).

The product of its digits is 27993600, while the sum is 56.

The spelling of 61664513663225 in words is "sixty-one trillion, six hundred sixty-four billion, five hundred thirteen million, six hundred sixty-three thousand, two hundred twenty-five".