78815517983 has 8 divisors (see below), whose sum is σ = 84369868800. Its totient is φ = 73401783768.

The previous prime is 78815517971. The next prime is 78815518009. The reversal of 78815517983 is 38971551887.

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 78815517983 - 2¹⁴ = 78815501599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78815517943) 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, 35152991 + ... + 35155232.

It is an arithmetic number, because the mean of its divisors is an integer number (10546233600).

Almost surely, 2^78815517983 is an apocalyptic number.

78815517983 is a deficient number, since it is larger than the sum of its proper divisors (5554350817).

78815517983 is a wasteful number, since it uses less digits than its factorization.

78815517983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70308301.

The product of its digits is 16934400, while the sum is 62.

The spelling of 78815517983 in words is "seventy-eight billion, eight hundred fifteen million, five hundred seventeen thousand, nine hundred eighty-three".