78725251546 has 16 divisors (see below), whose sum is σ = 119166358248. Its totient is φ = 39003328000.

The previous prime is 78725251543. The next prime is 78725251547. The reversal of 78725251546 is 64515252787.

It can be written as a sum of positive squares in 4 ways, for example, as 35519056225 + 43206195321 = 188465^2 + 207861^2 .

It is a junction number, because it is equal to n+sod(n) for n = 78725251493 and 78725251502.

It is not an unprimeable number, because it can be changed into a prime (78725251541) 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, 789366 + ... + 883486.

Almost surely, 2^78725251546 is an apocalyptic number.

78725251546 is a deficient number, since it is larger than the sum of its proper divisors (40441106702).

78725251546 is a wasteful number, since it uses less digits than its factorization.

78725251546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97937.

The product of its digits is 4704000, while the sum is 52.

The spelling of 78725251546 in words is "seventy-eight billion, seven hundred twenty-five million, two hundred fifty-one thousand, five hundred forty-six".