78667456136020 has 24 divisors (see below), whose sum is σ = 165241668148200. Its totient is φ = 31459361452032.

The previous prime is 78667456136011. The next prime is 78667456136023. The reversal of 78667456136020 is 2063165476687.

It can be written as a sum of positive squares in 4 ways, for example, as 28178558489104 + 50488897646916 = 5308348^2 + 7105554^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 78667456136020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78667456136023) 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, 476228005 + ... + 476393164.

It is an arithmetic number, because the mean of its divisors is an integer number (6885069506175).

Almost surely, 2^{78667456136020} is an apocalyptic number.

It is an amenable number.

78667456136020 is an abundant number, since it is smaller than the sum of its proper divisors (86574212012180).

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

78667456136020 is a wasteful number, since it uses less digits than its factorization.

78667456136020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 952625307 (or 952625305 counting only the distinct ones).

The product of its (nonzero) digits is 60963840, while the sum is 61.

The spelling of 78667456136020 in words is "seventy-eight trillion, six hundred sixty-seven billion, four hundred fifty-six million, one hundred thirty-six thousand, twenty".