61368242378977 has 2 divisors, whose sum is σ = 61368242378978. Its totient is φ = 61368242378976.

The previous prime is 61368242378969. The next prime is 61368242379043. The reversal of 61368242378977 is 77987324286316.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50535165398481 + 10833076980496 = 7108809^2 + 3291364^2 .

It is a cyclic number.

It is not a de Polignac number, because 61368242378977 - 2³ = 61368242378969 is a prime.

It is a super-2 number, since 2×61368242378977² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (61368242378777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30684121189488 + 30684121189489.

It is an arithmetic number, because the mean of its divisors is an integer number (30684121189489).

Almost surely, 2^{61368242378977} is an apocalyptic number.

It is an amenable number.

61368242378977 is a deficient number, since it is larger than the sum of its proper divisors (1).

61368242378977 is an equidigital number, since it uses as much as digits as its factorization.

61368242378977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1024192512, while the sum is 73.

The spelling of 61368242378977 in words is "sixty-one trillion, three hundred sixty-eight billion, two hundred forty-two million, three hundred seventy-eight thousand, nine hundred seventy-seven".