61878159977759 has 2 divisors, whose sum is σ = 61878159977760. Its totient is φ = 61878159977758.

The previous prime is 61878159977747. The next prime is 61878159977771. The reversal of 61878159977759 is 95777995187816.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (61878159977747) and next prime (61878159977771).

It is a cyclic number.

It is not a de Polignac number, because 61878159977759 - 2¹⁶ = 61878159912223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61878159977779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30939079988879 + 30939079988880.

It is an arithmetic number, because the mean of its divisors is an integer number (30939079988880).

Almost surely, 2^{61878159977759} is an apocalyptic number.

61878159977759 is a deficient number, since it is larger than the sum of its proper divisors (1).

61878159977759 is an equidigital number, since it uses as much as digits as its factorization.

61878159977759 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16803158400, while the sum is 89.

The spelling of 61878159977759 in words is "sixty-one trillion, eight hundred seventy-eight billion, one hundred fifty-nine million, nine hundred seventy-seven thousand, seven hundred fifty-nine".