61465555556389 has 2 divisors, whose sum is σ = 61465555556390. Its totient is φ = 61465555556388.

The previous prime is 61465555556351. The next prime is 61465555556417. The reversal of 61465555556389 is 98365555556416.

61465555556389 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61245258624225 + 220296932164 = 7825935^2 + 469358^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61465555556389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61465555556089) by changing a digit.

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 as a sum of consecutive naturals, namely, 30732777778194 + 30732777778195.

It is an arithmetic number, because the mean of its divisors is an integer number (30732777778195).

Almost surely, 2^{61465555556389} is an apocalyptic number.

It is an amenable number.

61465555556389 is a deficient number, since it is larger than the sum of its proper divisors (1).

61465555556389 is an equidigital number, since it uses as much as digits as its factorization.

61465555556389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2916000000, while the sum is 73.

The spelling of 61465555556389 in words is "sixty-one trillion, four hundred sixty-five billion, five hundred fifty-five million, five hundred fifty-six thousand, three hundred eighty-nine".