78289122953665 has 16 divisors (see below), whose sum is σ = 101433722317200. Its totient is φ = 57664885324032.

The previous prime is 78289122953653. The next prime is 78289122953807. The reversal of 78289122953665 is 56635922198287.

It can be written as a sum of positive squares in 8 ways, for example, as 1883185333264 + 76405937620401 = 1372292^2 + 8741049^2 .

It is a cyclic number.

It is not a de Polignac number, because 78289122953665 - 2²⁹ = 78288586082753 is a prime.

It is a super-2 number, since 2×78289122953665² (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 15 ways as a sum of consecutive naturals, for example, 1548108450 + ... + 1548159019.

It is an arithmetic number, because the mean of its divisors is an integer number (6339607644825).

Almost surely, 2^{78289122953665} is an apocalyptic number.

It is an amenable number.

78289122953665 is a deficient number, since it is larger than the sum of its proper divisors (23144599363535).

78289122953665 is a wasteful number, since it uses less digits than its factorization.

78289122953665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3096267876.

The product of its digits is 783820800, while the sum is 73.

The spelling of 78289122953665 in words is "seventy-eight trillion, two hundred eighty-nine billion, one hundred twenty-two million, nine hundred fifty-three thousand, six hundred sixty-five".