78216063526646 has 8 divisors (see below), whose sum is σ = 122425142911344. Its totient is φ = 37407682556200.

The previous prime is 78216063526639. The next prime is 78216063526649. The reversal of 78216063526646 is 64662536061287.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×78216063526646² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78216063526649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 850174603505 + ... + 850174603596.

It is an arithmetic number, because the mean of its divisors is an integer number (15303142863918).

Almost surely, 2^{78216063526646} is an apocalyptic number.

78216063526646 is a deficient number, since it is larger than the sum of its proper divisors (44209079384698).

78216063526646 is a wasteful number, since it uses less digits than its factorization.

78216063526646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1700349207126.

The product of its (nonzero) digits is 104509440, while the sum is 62.

The spelling of 78216063526646 in words is "seventy-eight trillion, two hundred sixteen billion, sixty-three million, five hundred twenty-six thousand, six hundred forty-six".