660221412 has 12 divisors (see below), whose sum is σ = 1540516656. Its totient is φ = 220073800.

The previous prime is 660221347. The next prime is 660221437. The reversal of 660221412 is 214122066.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27509214 + ... + 27509237.

It is an arithmetic number, because the mean of its divisors is an integer number (128376388).

Almost surely, 2^660221412 is an apocalyptic number.

It is an amenable number.

660221412 is an abundant number, since it is smaller than the sum of its proper divisors (880295244).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

660221412 is a wasteful number, since it uses less digits than its factorization.

660221412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55018458 (or 55018456 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 660221412 is about 25694.7740211896. The cubic root of 660221412 is about 870.7561189894.

Adding to 660221412 its reverse (214122066), we get a palindrome (874343478).

The spelling of 660221412 in words is "six hundred sixty million, two hundred twenty-one thousand, four hundred twelve".