321661377612 has 48 divisors (see below), whose sum is σ = 834002359680. Its totient is φ = 107212043664.

The previous prime is 321661377581. The next prime is 321661377643. The reversal of 321661377612 is 216773166123.

321661377612 is a `hidden beast` number, since 3 + 2 + 16 + 6 + 13 + 7 + 7 + 612 = 666.

It is an interprime number because it is at equal distance from previous prime (321661377581) and next prime (321661377643).

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, 1350363 + ... + 1570605.

It is an arithmetic number, because the mean of its divisors is an integer number (17375049160).

Almost surely, 2^321661377612 is an apocalyptic number.

It is an amenable number.

321661377612 is an abundant number, since it is smaller than the sum of its proper divisors (512340982068).

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

321661377612 is a wasteful number, since it uses less digits than its factorization.

321661377612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233779 (or 233771 counting only the distinct ones).

The product of its digits is 381024, while the sum is 45.

It can be divided in two parts, 3216613 and 77612, that added together give a square (3294225 = 1815²).

The spelling of 321661377612 in words is "three hundred twenty-one billion, six hundred sixty-one million, three hundred seventy-seven thousand, six hundred twelve".