321155052660 has 384 divisors, whose sum is σ = 1089787345920. Its totient is φ = 78046156800.

The previous prime is 321155052653. The next prime is 321155052677. The reversal of 321155052660 is 66250551123.

321155052660 is a `hidden beast` number, since 3 + 21 + 1 + 5 + 50 + 526 + 60 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 391175050 + ... + 391175870.

It is an arithmetic number, because the mean of its divisors is an integer number (2837987880).

Almost surely, 2^321155052660 is an apocalyptic number.

321155052660 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 321155052660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (544893672960).

321155052660 is an abundant number, since it is smaller than the sum of its proper divisors (768632293260).

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

321155052660 is a wasteful number, since it uses less digits than its factorization.

321155052660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1496 (or 1488 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 36.

The spelling of 321155052660 in words is "three hundred twenty-one billion, one hundred fifty-five million, fifty-two thousand, six hundred sixty".