661220053612 has 6 divisors (see below), whose sum is σ = 1157135093828. Its totient is φ = 330610026804.

The previous prime is 661220053597. The next prime is 661220053633. The reversal of 661220053612 is 216350022166.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82652506698 + ... + 82652506705.

Almost surely, 2^661220053612 is an apocalyptic number.

It is an amenable number.

661220053612 is a deficient number, since it is larger than the sum of its proper divisors (495915040216).

661220053612 is a wasteful number, since it uses less digits than its factorization.

661220053612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165305013407 (or 165305013405 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 34.

Adding to 661220053612 its reverse (216350022166), we get a palindrome (877570075778).

The spelling of 661220053612 in words is "six hundred sixty-one billion, two hundred twenty million, fifty-three thousand, six hundred twelve".