1641221656312 has 32 divisors (see below), whose sum is σ = 3525944479200. Its totient is φ = 701572523904.

The previous prime is 1641221656297. The next prime is 1641221656313. The reversal of 1641221656312 is 2136561221461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1641221656313) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37648563 + ... + 37692130.

It is an arithmetic number, because the mean of its divisors is an integer number (110185764975).

Almost surely, 2^{1641221656312} is an apocalyptic number.

It is an amenable number.

1641221656312 is an abundant number, since it is smaller than the sum of its proper divisors (1884722822888).

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

1641221656312 is a wasteful number, since it uses less digits than its factorization.

1641221656312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75341095 (or 75341091 counting only the distinct ones).

The product of its digits is 103680, while the sum is 40.

Adding to 1641221656312 its reverse (2136561221461), we get a palindrome (3777782877773).

The spelling of 1641221656312 in words is "one trillion, six hundred forty-one billion, two hundred twenty-one million, six hundred fifty-six thousand, three hundred twelve".