78801425681 has 4 divisors (see below), whose sum is σ = 85965191664. Its totient is φ = 71637659700.

The previous prime is 78801425623. The next prime is 78801425737. The reversal of 78801425681 is 18652410887.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18652410887 = 11 ⋅1695673717.

It is a cyclic number.

It is not a de Polignac number, because 78801425681 - 2⁶ = 78801425617 is a prime.

It is a super-2 number, since 2×78801425681² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78801425611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3581882975 + ... + 3581882996.

It is an arithmetic number, because the mean of its divisors is an integer number (21491297916).

Almost surely, 2^78801425681 is an apocalyptic number.

It is an amenable number.

78801425681 is a deficient number, since it is larger than the sum of its proper divisors (7163765983).

78801425681 is a wasteful number, since it uses less digits than its factorization.

78801425681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7163765982.

The product of its (nonzero) digits is 860160, while the sum is 50.

The spelling of 78801425681 in words is "seventy-eight billion, eight hundred one million, four hundred twenty-five thousand, six hundred eighty-one".