71678551663 has 8 divisors (see below), whose sum is σ = 71932037840. Its totient is φ = 71425307520.

The previous prime is 71678551627. The next prime is 71678551697. The reversal of 71678551663 is 36615587617.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 71678551663 - 2³³ = 63088617071 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71678551363) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 543448 + ... + 662338.

It is an arithmetic number, because the mean of its divisors is an integer number (8991504730).

Almost surely, 2^71678551663 is an apocalyptic number.

71678551663 is a deficient number, since it is larger than the sum of its proper divisors (253486177).

71678551663 is a wasteful number, since it uses less digits than its factorization.

71678551663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121017.

The product of its digits is 6350400, while the sum is 55.

The spelling of 71678551663 in words is "seventy-one billion, six hundred seventy-eight million, five hundred fifty-one thousand, six hundred sixty-three".