66788081826514 has 16 divisors (see below), whose sum is σ = 100336819812120. Its totient is φ = 33342476527360.

The previous prime is 66788081826449. The next prime is 66788081826647. The reversal of 66788081826514 is 41562818088766.

It can be written as a sum of positive squares in 4 ways, for example, as 62944658810289 + 3843423016225 = 7933767^2 + 1960465^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118864794 + ... + 119425354.

Almost surely, 2^{66788081826514} is an apocalyptic number.

66788081826514 is a deficient number, since it is larger than the sum of its proper divisors (33548737985606).

66788081826514 is a wasteful number, since it uses less digits than its factorization.

66788081826514 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 652445.

The product of its (nonzero) digits is 247726080, while the sum is 70.

The spelling of 66788081826514 in words is "sixty-six trillion, seven hundred eighty-eight billion, eighty-one million, eight hundred twenty-six thousand, five hundred fourteen".