78631571617 has 8 divisors (see below), whose sum is σ = 79352295840. Its totient is φ = 77913974880.

The previous prime is 78631571561. The next prime is 78631571621. The reversal of 78631571617 is 71617513687.

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 a de Polignac number, because none of the positive numbers 2^k-78631571617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78631571657) 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, 731343 + ... + 831940.

It is an arithmetic number, because the mean of its divisors is an integer number (9919036980).

Almost surely, 2^78631571617 is an apocalyptic number.

It is an amenable number.

78631571617 is a deficient number, since it is larger than the sum of its proper divisors (720724223).

78631571617 is a wasteful number, since it uses less digits than its factorization.

78631571617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1563743.

The product of its digits is 1481760, while the sum is 52.

The spelling of 78631571617 in words is "seventy-eight billion, six hundred thirty-one million, five hundred seventy-one thousand, six hundred seventeen".