78216086251580 has 24 divisors (see below), whose sum is σ = 164382204779520. Its totient is φ = 31261972852800.

The previous prime is 78216086251559. The next prime is 78216086251631. The reversal of 78216086251580 is 8515268061287.

It is a super-2 number, since 2×78216086251580² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1528826771 + ... + 1528877930.

It is an arithmetic number, because the mean of its divisors is an integer number (6849258532480).

Almost surely, 2^{78216086251580} is an apocalyptic number.

It is an amenable number.

78216086251580 is an abundant number, since it is smaller than the sum of its proper divisors (86166118527940).

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

78216086251580 is a wasteful number, since it uses less digits than its factorization.

78216086251580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3057705989 (or 3057705987 counting only the distinct ones).

The product of its (nonzero) digits is 12902400, while the sum is 59.

The spelling of 78216086251580 in words is "seventy-eight trillion, two hundred sixteen billion, eighty-six million, two hundred fifty-one thousand, five hundred eighty".