78508526881 has 2 divisors, whose sum is σ = 78508526882. Its totient is φ = 78508526880.

The previous prime is 78508526801. The next prime is 78508526903. The reversal of 78508526881 is 18862580587.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51840003856 + 26668523025 = 227684^2 + 163305^2 .

It is a cyclic number.

It is not a de Polignac number, because 78508526881 - 2¹⁹ = 78508002593 is a prime.

It is a super-2 number, since 2×78508526881² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78508526801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39254263440 + 39254263441.

It is an arithmetic number, because the mean of its divisors is an integer number (39254263441).

Almost surely, 2^78508526881 is an apocalyptic number.

It is an amenable number.

78508526881 is a deficient number, since it is larger than the sum of its proper divisors (1).

78508526881 is an equidigital number, since it uses as much as digits as its factorization.

78508526881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8601600, while the sum is 58.

The spelling of 78508526881 in words is "seventy-eight billion, five hundred eight million, five hundred twenty-six thousand, eight hundred eighty-one".