666731401198 has 4 divisors (see below), whose sum is σ = 1000097101800. Its totient is φ = 333365700598.

The previous prime is 666731401177. The next prime is 666731401229. The reversal of 666731401198 is 891104137666.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 891104137666 = 2 ⋅445552068833.

It is a super-2 number, since 2×666731401198² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166682850298 + ... + 166682850301.

It is an arithmetic number, because the mean of its divisors is an integer number (250024275450).

Almost surely, 2^666731401198 is an apocalyptic number.

666731401198 is a deficient number, since it is larger than the sum of its proper divisors (333365700602).

666731401198 is a wasteful number, since it uses less digits than its factorization.

666731401198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333365700601.

The product of its (nonzero) digits is 1306368, while the sum is 52.

The spelling of 666731401198 in words is "six hundred sixty-six billion, seven hundred thirty-one million, four hundred one thousand, one hundred ninety-eight".