78561716375280 has 160 divisors (see below), whose sum is σ = 257900114764800. Its totient is φ = 19714939785216.

The previous prime is 78561716375243. The next prime is 78561716375339. The reversal of 78561716375280 is 8257361716587.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30924381 + ... + 33368259.

It is an arithmetic number, because the mean of its divisors is an integer number (1611875717280).

Almost surely, 2^{78561716375280} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78561716375280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (128950057382400).

78561716375280 is an abundant number, since it is smaller than the sum of its proper divisors (179338398389520).

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

78561716375280 is a wasteful number, since it uses less digits than its factorization.

78561716375280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2451791 (or 2451785 counting only the distinct ones).

The product of its (nonzero) digits is 118540800, while the sum is 66.

The spelling of 78561716375280 in words is "seventy-eight trillion, five hundred sixty-one billion, seven hundred sixteen million, three hundred seventy-five thousand, two hundred eighty".