78213702803566 has 12 divisors (see below), whose sum is σ = 128955650490576. Its totient is φ = 35551683092420.

The previous prime is 78213702803543. The next prime is 78213702803629. The reversal of 78213702803566 is 66530820731287.

It is a super-2 number, since 2×78213702803566² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78213702803566.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 161598559270 + ... + 161598559753.

It is an arithmetic number, because the mean of its divisors is an integer number (10746304207548).

Almost surely, 2^{78213702803566} is an apocalyptic number.

78213702803566 is a deficient number, since it is larger than the sum of its proper divisors (50741947687010).

78213702803566 is a wasteful number, since it uses less digits than its factorization.

78213702803566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323197119047 (or 323197119036 counting only the distinct ones).

The product of its (nonzero) digits is 20321280, while the sum is 58.

The spelling of 78213702803566 in words is "seventy-eight trillion, two hundred thirteen billion, seven hundred two million, eight hundred three thousand, five hundred sixty-six".