398546540666 has 8 divisors (see below), whose sum is σ = 598419432660. Its totient is φ = 199073396448.

The previous prime is 398546540663. The next prime is 398546540671. The reversal of 398546540666 is 666045645893.

It can be written as a sum of positive squares in 2 ways, for example, as 296884406641 + 101662134025 = 544871^2 + 318845^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 398546540599 and 398546540608.

It is not an unprimeable number, because it can be changed into a prime (398546540663) 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, 99934451 + ... + 99938438.

Almost surely, 2^398546540666 is an apocalyptic number.

398546540666 is a deficient number, since it is larger than the sum of its proper divisors (199872891994).

398546540666 is a wasteful number, since it uses less digits than its factorization.

398546540666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199873888.

The product of its (nonzero) digits is 111974400, while the sum is 62.

The spelling of 398546540666 in words is "three hundred ninety-eight billion, five hundred forty-six million, five hundred forty thousand, six hundred sixty-six".