78256449251 has 2 divisors, whose sum is σ = 78256449252. Its totient is φ = 78256449250.

The previous prime is 78256449247. The next prime is 78256449263. The reversal of 78256449251 is 15294465287.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78256449251 - 2² = 78256449247 is a prime.

It is a super-2 number, since 2×78256449251² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78256449193 and 78256449202.

It is not a weakly prime, because it can be changed into another prime (78256449211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39128224625 + 39128224626.

It is an arithmetic number, because the mean of its divisors is an integer number (39128224626).

Almost surely, 2^78256449251 is an apocalyptic number.

78256449251 is a deficient number, since it is larger than the sum of its proper divisors (1).

78256449251 is an equidigital number, since it uses as much as digits as its factorization.

78256449251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4838400, while the sum is 53.

The spelling of 78256449251 in words is "seventy-eight billion, two hundred fifty-six million, four hundred forty-nine thousand, two hundred fifty-one".