78439044722725 has 6 divisors (see below), whose sum is σ = 97264415456210. Its totient is φ = 62751235778160.

The previous prime is 78439044722713. The next prime is 78439044722747. The reversal of 78439044722725 is 52722744093487.

It is a happy number.

It is a Cunningham number, because it is equal to 8856582²+1.

It can be written as a sum of positive squares in 3 ways, for example, as 1 + 78439044722724 = 1^2 + 8856582^2 .

It is not a de Polignac number, because 78439044722725 - 2¹³ = 78439044714533 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1568780894430 + ... + 1568780894479.

Almost surely, 2^{78439044722725} is an apocalyptic number.

It is an amenable number.

78439044722725 is a deficient number, since it is larger than the sum of its proper divisors (18825370733485).

78439044722725 is a wasteful number, since it uses less digits than its factorization.

78439044722725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3137561788919 (or 3137561788914 counting only the distinct ones).

The product of its (nonzero) digits is 189665280, while the sum is 64.

The spelling of 78439044722725 in words is "seventy-eight trillion, four hundred thirty-nine billion, forty-four million, seven hundred twenty-two thousand, seven hundred twenty-five".