78568740821660 has 48 divisors (see below), whose sum is σ = 166706934288384. Its totient is φ = 31101336004608.

The previous prime is 78568740821621. The next prime is 78568740821663. The reversal of 78568740821660 is 6612804786587.

It is a super-3 number, since 3×78568740821660³ (a number of 43 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78568740821663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26605157 + ... + 29410403.

It is an arithmetic number, because the mean of its divisors is an integer number (3473061131008).

Almost surely, 2^{78568740821660} is an apocalyptic number.

It is an amenable number.

78568740821660 is an abundant number, since it is smaller than the sum of its proper divisors (88138193466724).

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

78568740821660 is a wasteful number, since it uses less digits than its factorization.

78568740821660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2819790 (or 2819788 counting only the distinct ones).

The product of its (nonzero) digits is 216760320, while the sum is 68.

The spelling of 78568740821660 in words is "seventy-eight trillion, five hundred sixty-eight billion, seven hundred forty million, eight hundred twenty-one thousand, six hundred sixty".