78221403617 has 8 divisors (see below), whose sum is σ = 89410200000. Its totient is φ = 67036184784.

The previous prime is 78221403613. The next prime is 78221403647. The reversal of 78221403617 is 71630412287.

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 78221403617 - 2² = 78221403613 is a prime.

It is a super-2 number, since 2×78221403617² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78221403613) 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, 847367 + ... + 935132.

It is an arithmetic number, because the mean of its divisors is an integer number (11176275000).

Almost surely, 2^78221403617 is an apocalyptic number.

It is an amenable number.

78221403617 is a deficient number, since it is larger than the sum of its proper divisors (11188796383).

78221403617 is a wasteful number, since it uses less digits than its factorization.

78221403617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1788775.

The product of its (nonzero) digits is 112896, while the sum is 41.

The spelling of 78221403617 in words is "seventy-eight billion, two hundred twenty-one million, four hundred three thousand, six hundred seventeen".