61395749775961 has 2 divisors, whose sum is σ = 61395749775962. Its totient is φ = 61395749775960.

The previous prime is 61395749775901. The next prime is 61395749775979. The reversal of 61395749775961 is 16957794759316.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61395749775936 + 25 = 7835544^2 + 5^2 .

It is a cyclic number.

It is not a de Polignac number, because 61395749775961 - 2⁹ = 61395749775449 is a prime.

It is not a weakly prime, because it can be changed into another prime (61395749775901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30697874887980 + 30697874887981.

It is an arithmetic number, because the mean of its divisors is an integer number (30697874887981).

Almost surely, 2^{61395749775961} is an apocalyptic number.

It is an amenable number.

61395749775961 is a deficient number, since it is larger than the sum of its proper divisors (1).

61395749775961 is an equidigital number, since it uses as much as digits as its factorization.

61395749775961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2700507600, while the sum is 79.

The spelling of 61395749775961 in words is "sixty-one trillion, three hundred ninety-five billion, seven hundred forty-nine million, seven hundred seventy-five thousand, nine hundred sixty-one".