1666742478298 has 16 divisors (see below), whose sum is σ = 2738461274280. Its totient is φ = 757302870016.

The previous prime is 1666742478293. The next prime is 1666742478311. The reversal of 1666742478298 is 8928742476661.

It can be written as a sum of positive squares in 4 ways, for example, as 1333394444529 + 333348033769 = 1154727^2 + 577363^2 .

It is a super-3 number, since 3×1666742478298³ (a number of 38 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1666742478293) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 845203111 + ... + 845205082.

Almost surely, 2^{1666742478298} is an apocalyptic number.

1666742478298 is a deficient number, since it is larger than the sum of its proper divisors (1071718795982).

1666742478298 is a wasteful number, since it uses less digits than its factorization.

1666742478298 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1690408241.

The product of its digits is 390168576, while the sum is 70.

The spelling of 1666742478298 in words is "one trillion, six hundred sixty-six billion, seven hundred forty-two million, four hundred seventy-eight thousand, two hundred ninety-eight".