78070666825 has 6 divisors (see below), whose sum is σ = 96807626894. Its totient is φ = 62456533440.

The previous prime is 78070666783. The next prime is 78070666853. The reversal of 78070666825 is 52866607087.

It can be written as a sum of positive squares in 3 ways, for example, as 1170939961 + 76899726864 = 34219^2 + 277308^2 .

It is not a de Polignac number, because 78070666825 - 2²⁵ = 78037112393 is a prime.

It is a Duffinian 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, 1561413312 + ... + 1561413361.

Almost surely, 2^78070666825 is an apocalyptic number.

It is an amenable number.

78070666825 is a deficient number, since it is larger than the sum of its proper divisors (18736960069).

78070666825 is a wasteful number, since it uses less digits than its factorization.

78070666825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3122826683 (or 3122826678 counting only the distinct ones).

The product of its (nonzero) digits is 6773760, while the sum is 55.

The spelling of 78070666825 in words is "seventy-eight billion, seventy million, six hundred sixty-six thousand, eight hundred twenty-five".