1621166632 has 16 divisors (see below), whose sum is σ = 3050432640. Its totient is φ = 807717936.

The previous prime is 1621166627. The next prime is 1621166633. The reversal of 1621166632 is 2366611261.

It is not an unprimeable number, because it can be changed into a prime (1621166633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 355768 + ... + 360295.

It is an arithmetic number, because the mean of its divisors is an integer number (190652040).

Almost surely, 2^1621166632 is an apocalyptic number.

It is an amenable number.

1621166632 is a deficient number, since it is larger than the sum of its proper divisors (1429266008).

1621166632 is a wasteful number, since it uses less digits than its factorization.

1621166632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 716352 (or 716348 counting only the distinct ones).

The product of its digits is 15552, while the sum is 34.

The square root of 1621166632 is about 40263.7135892853. The cubic root of 1621166632 is about 1174.7421512368.

Adding to 1621166632 its reverse (2366611261), we get a palindrome (3987777893).

The spelling of 1621166632 in words is "one billion, six hundred twenty-one million, one hundred sixty-six thousand, six hundred thirty-two".