78078643617 has 8 divisors (see below), whose sum is σ = 112112924224. Its totient is φ = 48048396048.

The previous prime is 78078643603. The next prime is 78078643633. The reversal of 78078643617 is 71634687087.

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

It is not a de Polignac number, because 78078643617 - 2⁶ = 78078643553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78078643637) 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, 1001008213 + ... + 1001008290.

It is an arithmetic number, because the mean of its divisors is an integer number (14014115528).

Almost surely, 2^78078643617 is an apocalyptic number.

It is an amenable number.

78078643617 is a deficient number, since it is larger than the sum of its proper divisors (34034280607).

78078643617 is a wasteful number, since it uses less digits than its factorization.

78078643617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2002016519.

The product of its (nonzero) digits is 9483264, while the sum is 57.

The spelling of 78078643617 in words is "seventy-eight billion, seventy-eight million, six hundred forty-three thousand, six hundred seventeen".