71678388787969 has 16 divisors (see below), whose sum is σ = 76758526141200. Its totient is φ = 66694442450944.

The previous prime is 71678388787727. The next prime is 71678388787987. The reversal of 71678388787969 is 96978788387617.

It can be written as a sum of positive squares in 8 ways, for example, as 15391627969 + 71662997160000 = 124063^2 + 8465400^2 .

It is a cyclic number.

It is not a de Polignac number, because 71678388787969 - 2¹⁹ = 71678388263681 is a prime.

It is a super-2 number, since 2×71678388787969² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71678388788969) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7161117 + ... + 13951285.

It is an arithmetic number, because the mean of its divisors is an integer number (4797407883825).

Almost surely, 2^{71678388787969} is an apocalyptic number.

It is an amenable number.

71678388787969 is a deficient number, since it is larger than the sum of its proper divisors (5080137353231).

71678388787969 is a wasteful number, since it uses less digits than its factorization.

71678388787969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6797252.

The product of its digits is 86032171008, while the sum is 94.

The spelling of 71678388787969 in words is "seventy-one trillion, six hundred seventy-eight billion, three hundred eighty-eight million, seven hundred eighty-seven thousand, nine hundred sixty-nine".