78071751615816 has 144 divisors (see below), whose sum is σ = 252613576217340. Its totient is φ = 21703344042240.

The previous prime is 78071751615797. The next prime is 78071751615829. The reversal of 78071751615816 is 61851615717087.

78071751615816 is a `hidden beast` number, since 7 + 8 + 0 + 7 + 1 + 7 + 5 + 1 + 615 + 8 + 1 + 6 = 666.

78071751615816 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 70161899112900 + 7909852502916 = 8376270^2 + 2812446^2 .

It is a super-2 number, since 2×78071751615816² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 298912455 + ... + 299173526.

Almost surely, 2^{78071751615816} is an apocalyptic number.

It is an amenable number.

78071751615816 is an abundant number, since it is smaller than the sum of its proper divisors (174541824601524).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78071751615816 is a wasteful number, since it uses less digits than its factorization.

78071751615816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 598086044 (or 598086030 counting only the distinct ones).

The product of its (nonzero) digits is 19756800, while the sum is 63.

The spelling of 78071751615816 in words is "seventy-eight trillion, seventy-one billion, seven hundred fifty-one million, six hundred fifteen thousand, eight hundred sixteen".