61493653561 has 2 divisors, whose sum is σ = 61493653562. Its totient is φ = 61493653560.

The previous prime is 61493653547. The next prime is 61493653583. The reversal of 61493653561 is 16535639416.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55018393600 + 6475259961 = 234560^2 + 80469^2 .

It is a cyclic number.

It is not a de Polignac number, because 61493653561 - 2¹⁹ = 61493129273 is a prime.

It is not a weakly prime, because it can be changed into another prime (61493653591) 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 as a sum of consecutive naturals, namely, 30746826780 + 30746826781.

It is an arithmetic number, because the mean of its divisors is an integer number (30746826781).

Almost surely, 2^61493653561 is an apocalyptic number.

It is an amenable number.

61493653561 is a deficient number, since it is larger than the sum of its proper divisors (1).

61493653561 is an equidigital number, since it uses as much as digits as its factorization.

61493653561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1749600, while the sum is 49.

The spelling of 61493653561 in words is "sixty-one billion, four hundred ninety-three million, six hundred fifty-three thousand, five hundred sixty-one".