78251309827 has 2 divisors, whose sum is σ = 78251309828. Its totient is φ = 78251309826.

The previous prime is 78251309813. The next prime is 78251309861. The reversal of 78251309827 is 72890315287.

It is a weak prime.

It is an emirp because it is prime and its reverse (72890315287) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78251309827 - 2⁷ = 78251309699 is a prime.

It is a super-2 number, since 2×78251309827² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78251309627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39125654913 + 39125654914.

It is an arithmetic number, because the mean of its divisors is an integer number (39125654914).

Almost surely, 2^78251309827 is an apocalyptic number.

78251309827 is a deficient number, since it is larger than the sum of its proper divisors (1).

78251309827 is an equidigital number, since it uses as much as digits as its factorization.

78251309827 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1693440, while the sum is 52.

The spelling of 78251309827 in words is "seventy-eight billion, two hundred fifty-one million, three hundred nine thousand, eight hundred twenty-seven".