666731401202 has 8 divisors (see below), whose sum is σ = 1009999053612. Its totient is φ = 330065050000.

The previous prime is 666731401177. The next prime is 666731401229. The reversal of 666731401202 is 202104137666.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 564074600401 + 102656800801 = 751049^2 + 320401^2 .

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

It is a super-2 number, since 2×666731401202² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1650325049 + ... + 1650325452.

Almost surely, 2^666731401202 is an apocalyptic number.

666731401202 is a deficient number, since it is larger than the sum of its proper divisors (343267652410).

666731401202 is a wasteful number, since it uses less digits than its factorization.

666731401202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3300650604.

The product of its (nonzero) digits is 72576, while the sum is 38.

Adding to 666731401202 its reverse (202104137666), we get a palindrome (868835538868).

The spelling of 666731401202 in words is "six hundred sixty-six billion, seven hundred thirty-one million, four hundred one thousand, two hundred two".