78406235225 has 6 divisors (see below), whose sum is σ = 97223731710. Its totient is φ = 62724988160.

The previous prime is 78406235209. The next prime is 78406235233. The reversal of 78406235225 is 52253260487.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 17003377609 + 61402857616 = 130397^2 + 247796^2 .

It is not a de Polignac number, because 78406235225 - 2⁴ = 78406235209 is a prime.

It is a super-2 number, since 2×78406235225² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1568124680 + ... + 1568124729.

It is an arithmetic number, because the mean of its divisors is an integer number (16203955285).

Almost surely, 2^78406235225 is an apocalyptic number.

It is an amenable number.

78406235225 is a deficient number, since it is larger than the sum of its proper divisors (18817496485).

78406235225 is a wasteful number, since it uses less digits than its factorization.

78406235225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3136249419 (or 3136249414 counting only the distinct ones).

The product of its (nonzero) digits is 806400, while the sum is 44.

The spelling of 78406235225 in words is "seventy-eight billion, four hundred six million, two hundred thirty-five thousand, two hundred twenty-five".