78412581815 has 8 divisors (see below), whose sum is σ = 94096602288. Its totient is φ = 62729062720.

The previous prime is 78412581781. The next prime is 78412581817. The reversal of 78412581815 is 51818521487.

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

It is not a de Polignac number, because 78412581815 - 2¹⁰ = 78412580791 is a prime.

It is a super-2 number, since 2×78412581815² (a number of 23 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 (78412581817) 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, 534884 + ... + 665526.

It is an arithmetic number, because the mean of its divisors is an integer number (11762075286).

Almost surely, 2^78412581815 is an apocalyptic number.

78412581815 is a deficient number, since it is larger than the sum of its proper divisors (15684020473).

78412581815 is a wasteful number, since it uses less digits than its factorization.

78412581815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250689.

The product of its digits is 716800, while the sum is 50.

The spelling of 78412581815 in words is "seventy-eight billion, four hundred twelve million, five hundred eighty-one thousand, eight hundred fifteen".