61993983642565 has 16 divisors (see below), whose sum is σ = 83598575937408. Its totient is φ = 43789730250816.

The previous prime is 61993983642527. The next prime is 61993983642589. The reversal of 61993983642565 is 56524638939916.

61993983642565 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 61993983642565 - 2³⁹ = 61444227828677 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61993983642491 and 61993983642500.

It is a congruent 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 15 ways as a sum of consecutive naturals, for example, 20733772299 + ... + 20733775288.

It is an arithmetic number, because the mean of its divisors is an integer number (5224910996088).

Almost surely, 2^{61993983642565} is an apocalyptic number.

61993983642565 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

61993983642565 is a deficient number, since it is larger than the sum of its proper divisors (21604592294843).

61993983642565 is a wasteful number, since it uses less digits than its factorization.

61993983642565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41467547628.

The product of its digits is 2267481600, while the sum is 76.

The spelling of 61993983642565 in words is "sixty-one trillion, nine hundred ninety-three billion, nine hundred eighty-three million, six hundred forty-two thousand, five hundred sixty-five".