78021425681 has 8 divisors (see below), whose sum is σ = 80828644800. Its totient is φ = 75221994960.

The previous prime is 78021425617. The next prime is 78021425717. The reversal of 78021425681 is 18652412087.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78021425681 - 2⁶ = 78021425617 is a prime.

It is a super-2 number, since 2×78021425681² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78021425281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1926701 + ... + 1966778.

It is an arithmetic number, because the mean of its divisors is an integer number (10103580600).

Almost surely, 2^78021425681 is an apocalyptic number.

It is an amenable number.

78021425681 is a deficient number, since it is larger than the sum of its proper divisors (2807219119).

78021425681 is a wasteful number, since it uses less digits than its factorization.

78021425681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3894199.

The product of its (nonzero) digits is 215040, while the sum is 44.

The spelling of 78021425681 in words is "seventy-eight billion, twenty-one million, four hundred twenty-five thousand, six hundred eighty-one".