1621308648906 has 64 divisors (see below), whose sum is σ = 3625647235200. Its totient is φ = 537033369600.

The previous prime is 1621308648899. The next prime is 1621308648929. The reversal of 1621308648906 is 6098468031261.

1621308648906 is a `hidden beast` number, since 1 + 621 + 3 + 0 + 8 + 6 + 4 + 8 + 9 + 0 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7192560 + ... + 7414548.

It is an arithmetic number, because the mean of its divisors is an integer number (56650738050).

Almost surely, 2^{1621308648906} is an apocalyptic number.

1621308648906 is an abundant number, since it is smaller than the sum of its proper divisors (2004338586294).

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

1621308648906 is a wasteful number, since it uses less digits than its factorization.

1621308648906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222852 (or 222846 counting only the distinct ones).

The product of its (nonzero) digits is 2985984, while the sum is 54.

The spelling of 1621308648906 in words is "one trillion, six hundred twenty-one billion, three hundred eight million, six hundred forty-eight thousand, nine hundred six".