78884427139961 has 2 divisors, whose sum is σ = 78884427139962. Its totient is φ = 78884427139960.

The previous prime is 78884427139957. The next prime is 78884427140053. The reversal of 78884427139961 is 16993172448887.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71530676371561 + 7353750768400 = 8457581^2 + 2711780^2 .

It is a cyclic number.

It is not a de Polignac number, because 78884427139961 - 2² = 78884427139957 is a prime.

It is not a weakly prime, because it can be changed into another prime (78884427139361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39442213569980 + 39442213569981.

It is an arithmetic number, because the mean of its divisors is an integer number (39442213569981).

Almost surely, 2^{78884427139961} is an apocalyptic number.

It is an amenable number.

78884427139961 is a deficient number, since it is larger than the sum of its proper divisors (1).

78884427139961 is an equidigital number, since it uses as much as digits as its factorization.

78884427139961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1170505728, while the sum is 77.

The spelling of 78884427139961 in words is "seventy-eight trillion, eight hundred eighty-four billion, four hundred twenty-seven million, one hundred thirty-nine thousand, nine hundred sixty-one".