78997381966 has 16 divisors (see below), whose sum is σ = 123362936640. Its totient is φ = 37893754080.

The previous prime is 78997381951. The next prime is 78997381979. The reversal of 78997381966 is 66918379987.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4328550 + ... + 4346761.

It is an arithmetic number, because the mean of its divisors is an integer number (7710183540).

Almost surely, 2^78997381966 is an apocalyptic number.

78997381966 is a deficient number, since it is larger than the sum of its proper divisors (44365554674).

78997381966 is a wasteful number, since it uses less digits than its factorization.

78997381966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8675499.

The product of its digits is 246903552, while the sum is 73.

The spelling of 78997381966 in words is "seventy-eight billion, nine hundred ninety-seven million, three hundred eighty-one thousand, nine hundred sixty-six".