78317421619 has 8 divisors (see below), whose sum is σ = 79298693712. Its totient is φ = 77337047040.

The previous prime is 78317421617. The next prime is 78317421649. The reversal of 78317421619 is 91612471387.

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 78317421619 - 2¹ = 78317421617 is a prime.

It is a super-2 number, since 2×78317421619² (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 (78317421617) 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, 47902 + ... + 398659.

It is an arithmetic number, because the mean of its divisors is an integer number (9912336714).

Almost surely, 2^78317421619 is an apocalyptic number.

78317421619 is a deficient number, since it is larger than the sum of its proper divisors (981272093).

78317421619 is a wasteful number, since it uses less digits than its factorization.

78317421619 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 448757.

The product of its digits is 508032, while the sum is 49.

The spelling of 78317421619 in words is "seventy-eight billion, three hundred seventeen million, four hundred twenty-one thousand, six hundred nineteen".