78356563718865 has 8 divisors (see below), whose sum is σ = 125370501950208. Its totient is φ = 41790167316720.

The previous prime is 78356563718843. The next prime is 78356563718903. The reversal of 78356563718865 is 56881736565387.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78356563718865 - 2¹² = 78356563714769 is a prime.

It is a super-2 number, since 2×78356563718865² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2611885457281 + ... + 2611885457310.

It is an arithmetic number, because the mean of its divisors is an integer number (15671312743776).

Almost surely, 2^{78356563718865} is an apocalyptic number.

It is an amenable number.

78356563718865 is a deficient number, since it is larger than the sum of its proper divisors (47013938231343).

78356563718865 is a wasteful number, since it uses less digits than its factorization.

78356563718865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5223770914599.

The product of its digits is 6096384000, while the sum is 78.

The spelling of 78356563718865 in words is "seventy-eight trillion, three hundred fifty-six billion, five hundred sixty-three million, seven hundred eighteen thousand, eight hundred sixty-five".