66782557551306 has 32 divisors (see below), whose sum is σ = 140233059627840. Its totient is φ = 21172442328576.

The previous prime is 66782557551289. The next prime is 66782557551317. The reversal of 66782557551306 is 60315575528766.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2864225671 + ... + 2864248986.

It is an arithmetic number, because the mean of its divisors is an integer number (4382283113370).

Almost surely, 2^{66782557551306} is an apocalyptic number.

66782557551306 is an abundant number, since it is smaller than the sum of its proper divisors (73450502076534).

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

66782557551306 is a wasteful number, since it uses less digits than its factorization.

66782557551306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5728474758.

The product of its (nonzero) digits is 317520000, while the sum is 66.

The spelling of 66782557551306 in words is "sixty-six trillion, seven hundred eighty-two billion, five hundred fifty-seven million, five hundred fifty-one thousand, three hundred six".