78511190057 has 2 divisors, whose sum is σ = 78511190058. Its totient is φ = 78511190056.

The previous prime is 78511190053. The next prime is 78511190063. The reversal of 78511190057 is 75009111587.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43693122841 + 34818067216 = 209029^2 + 186596^2 .

It is a cyclic number.

It is not a de Polignac number, because 78511190057 - 2² = 78511190053 is a prime.

It is not a weakly prime, because it can be changed into another prime (78511190053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39255595028 + 39255595029.

It is an arithmetic number, because the mean of its divisors is an integer number (39255595029).

Almost surely, 2^78511190057 is an apocalyptic number.

It is an amenable number.

78511190057 is a deficient number, since it is larger than the sum of its proper divisors (1).

78511190057 is an equidigital number, since it uses as much as digits as its factorization.

78511190057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 88200, while the sum is 44.

The spelling of 78511190057 in words is "seventy-eight billion, five hundred eleven million, one hundred ninety thousand, fifty-seven".