78148428601561 has 2 divisors, whose sum is σ = 78148428601562. Its totient is φ = 78148428601560.

The previous prime is 78148428601541. The next prime is 78148428601577. The reversal of 78148428601561 is 16510682484187.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70769903875225 + 7378524726336 = 8412485^2 + 2716344^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78148428601561 is a prime.

It is a super-2 number, since 2×78148428601561² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78148428601561.

It is not a weakly prime, because it can be changed into another prime (78148428601501) 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, 39074214300780 + 39074214300781.

It is an arithmetic number, because the mean of its divisors is an integer number (39074214300781).

Almost surely, 2^{78148428601561} is an apocalyptic number.

It is an amenable number.

78148428601561 is a deficient number, since it is larger than the sum of its proper divisors (1).

78148428601561 is an equidigital number, since it uses as much as digits as its factorization.

78148428601561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20643840, while the sum is 61.

The spelling of 78148428601561 in words is "seventy-eight trillion, one hundred forty-eight billion, four hundred twenty-eight million, six hundred one thousand, five hundred sixty-one".