78661320850 has 48 divisors (see below), whose sum is σ = 169952711616. Its totient is φ = 26527464000.

The previous prime is 78661320847. The next prime is 78661320863. The reversal of 78661320850 is 5802316687.

It is a self number, because there is not a number n which added to its sum of digits gives 78661320850.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1820836 + ... + 1863535.

It is an arithmetic number, because the mean of its divisors is an integer number (3540681492).

Almost surely, 2^78661320850 is an apocalyptic number.

78661320850 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

78661320850 is an abundant number, since it is smaller than the sum of its proper divisors (91291390766).

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

78661320850 is a wasteful number, since it uses less digits than its factorization.

78661320850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3684451 (or 3684446 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 46.

The spelling of 78661320850 in words is "seventy-eight billion, six hundred sixty-one million, three hundred twenty thousand, eight hundred fifty".