66467371778 has 16 divisors (see below), whose sum is σ = 101110275000. Its totient is φ = 32766087552.

The previous prime is 66467371739. The next prime is 66467371787. The reversal of 66467371778 is 87717376466.

It can be written as a sum of positive squares in 4 ways, for example, as 58053529249 + 8413842529 = 240943^2 + 91727^2 .

It is a super-2 number, since 2×66467371778² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66467371778.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 472853 + ... + 597096.

Almost surely, 2^66467371778 is an apocalyptic number.

66467371778 is a deficient number, since it is larger than the sum of its proper divisors (34642903222).

66467371778 is a wasteful number, since it uses less digits than its factorization.

66467371778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1070389.

The product of its digits is 49787136, while the sum is 62.

The spelling of 66467371778 in words is "sixty-six billion, four hundred sixty-seven million, three hundred seventy-one thousand, seven hundred seventy-eight".