78439054556 has 6 divisors (see below), whose sum is σ = 137268345480. Its totient is φ = 39219527276.

The previous prime is 78439054549. The next prime is 78439054621. The reversal of 78439054556 is 65545093487.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9804881816 + ... + 9804881823.

It is an arithmetic number, because the mean of its divisors is an integer number (22878057580).

Almost surely, 2^78439054556 is an apocalyptic number.

It is an amenable number.

78439054556 is a deficient number, since it is larger than the sum of its proper divisors (58829290924).

78439054556 is a wasteful number, since it uses less digits than its factorization.

78439054556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19609763643 (or 19609763641 counting only the distinct ones).

The product of its (nonzero) digits is 18144000, while the sum is 56.

The spelling of 78439054556 in words is "seventy-eight billion, four hundred thirty-nine million, fifty-four thousand, five hundred fifty-six".