78464736665 has 64 divisors (see below), whose sum is σ = 116914710528. Its totient is φ = 49320960000.

The previous prime is 78464736619. The next prime is 78464736697. The reversal of 78464736665 is 56663746487.

It is not a de Polignac number, because 78464736665 - 2¹⁴ = 78464720281 is a prime.

It is a Smith number, since the sum of its digits (62) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 78464736598 and 78464736607.

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 63 ways as a sum of consecutive naturals, for example, 16513040 + ... + 16517790.

It is an arithmetic number, because the mean of its divisors is an integer number (1826792352).

Almost surely, 2^78464736665 is an apocalyptic number.

It is an amenable number.

78464736665 is a deficient number, since it is larger than the sum of its proper divisors (38449973863).

78464736665 is a wasteful number, since it uses less digits than its factorization.

78464736665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5498.

The product of its digits is 121927680, while the sum is 62.

The spelling of 78464736665 in words is "seventy-eight billion, four hundred sixty-four million, seven hundred thirty-six thousand, six hundred sixty-five".