661546303412 has 12 divisors (see below), whose sum is σ = 1225806385860. Its totient is φ = 311315907456.

The previous prime is 661546303403. The next prime is 661546303421. The reversal of 661546303412 is 214303645166.

It is an interprime number because it is at equal distance from previous prime (661546303403) and next prime (661546303421).

It can be written as a sum of positive squares in 2 ways, for example, as 502405945636 + 159140357776 = 708806^2 + 398924^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 661546303412.

It is a congruent number.

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, 4864310987 + ... + 4864311122.

It is an arithmetic number, because the mean of its divisors is an integer number (102150532155).

Almost surely, 2^661546303412 is an apocalyptic number.

It is an amenable number.

661546303412 is a deficient number, since it is larger than the sum of its proper divisors (564260082448).

661546303412 is a wasteful number, since it uses less digits than its factorization.

661546303412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9728622130 (or 9728622128 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 41.

Adding to 661546303412 its reverse (214303645166), we get a palindrome (875849948578).

The spelling of 661546303412 in words is "six hundred sixty-one billion, five hundred forty-six million, three hundred three thousand, four hundred twelve".