78841661406 has 32 divisors (see below), whose sum is σ = 166621916160. Its totient is φ = 24819716064.

The previous prime is 78841661389. The next prime is 78841661417. The reversal of 78841661406 is 60416614887.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3605025 + ... + 3626828.

It is an arithmetic number, because the mean of its divisors is an integer number (5206934880).

Almost surely, 2^78841661406 is an apocalyptic number.

78841661406 is an abundant number, since it is smaller than the sum of its proper divisors (87780254754).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78841661406 is a wasteful number, since it uses less digits than its factorization.

78841661406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7231960.

The product of its (nonzero) digits is 1548288, while the sum is 51.

The spelling of 78841661406 in words is "seventy-eight billion, eight hundred forty-one million, six hundred sixty-one thousand, four hundred six".