78881446611517 has 8 divisors (see below), whose sum is σ = 86052883436640. Its totient is φ = 71710075823760.

The previous prime is 78881446611503. The next prime is 78881446611529. The reversal of 78881446611517 is 71511664418887.

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

It is not a de Polignac number, because 78881446611517 - 2¹⁵ = 78881446578749 is a prime.

It is a super-2 number, since 2×78881446611517² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78881446611017) 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, 13995103 + ... + 18804940.

It is an arithmetic number, because the mean of its divisors is an integer number (10756610429580).

Almost surely, 2^{78881446611517} is an apocalyptic number.

It is an amenable number.

78881446611517 is a deficient number, since it is larger than the sum of its proper divisors (7171436825123).

78881446611517 is a wasteful number, since it uses less digits than its factorization.

78881446611517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33018683.

The product of its digits is 72253440, while the sum is 67.

The spelling of 78881446611517 in words is "seventy-eight trillion, eight hundred eighty-one billion, four hundred forty-six million, six hundred eleven thousand, five hundred seventeen".