78788412658 has 4 divisors (see below), whose sum is σ = 118182618990. Its totient is φ = 39394206328.

The previous prime is 78788412631. The next prime is 78788412667. The reversal of 78788412658 is 85621488787.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 71018519049 + 7769893609 = 266493^2 + 88147^2 .

It is a super-2 number, since 2×78788412658² (a number of 23 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 78788412658.

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 as a sum of consecutive naturals, namely, 19697103163 + ... + 19697103166.

Almost surely, 2^78788412658 is an apocalyptic number.

78788412658 is a deficient number, since it is larger than the sum of its proper divisors (39394206332).

78788412658 is a wasteful number, since it uses less digits than its factorization.

78788412658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39394206331.

The product of its digits is 48168960, while the sum is 64.

The spelling of 78788412658 in words is "seventy-eight billion, seven hundred eighty-eight million, four hundred twelve thousand, six hundred fifty-eight".