78578808658 has 16 divisors (see below), whose sum is σ = 134760023424. Its totient is φ = 33663258720.

The previous prime is 78578808647. The next prime is 78578808673. The reversal of 78578808658 is 85680887587.

It is a super-2 number, since 2×78578808658² (a number of 23 digits) contains 22 as substring.

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 in 7 ways as a sum of consecutive naturals, for example, 1077910 + ... + 1148497.

It is an arithmetic number, because the mean of its divisors is an integer number (8422501464).

Almost surely, 2^78578808658 is an apocalyptic number.

78578808658 is a deficient number, since it is larger than the sum of its proper divisors (56181214766).

78578808658 is a wasteful number, since it uses less digits than its factorization.

78578808658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2228937.

The product of its (nonzero) digits is 240844800, while the sum is 70.

The spelling of 78578808658 in words is "seventy-eight billion, five hundred seventy-eight million, eight hundred eight thousand, six hundred fifty-eight".