661563163412 has 48 divisors (see below), whose sum is σ = 1166763865344. Its totient is φ = 328215888000.

The previous prime is 661563163403. The next prime is 661563163501. The reversal of 661563163412 is 214361365166.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 282597362 + ... + 282599702.

It is an arithmetic number, because the mean of its divisors is an integer number (24307580528).

Almost surely, 2^661563163412 is an apocalyptic number.

It is an amenable number.

661563163412 is a deficient number, since it is larger than the sum of its proper divisors (505200701932).

661563163412 is a wasteful number, since it uses less digits than its factorization.

661563163412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3600 (or 3598 counting only the distinct ones).

The product of its digits is 466560, while the sum is 44.

The spelling of 661563163412 in words is "six hundred sixty-one billion, five hundred sixty-three million, one hundred sixty-three thousand, four hundred twelve".