1621098158628 has 384 divisors, whose sum is σ = 4492791152640. Its totient is φ = 450804879360.

The previous prime is 1621098158591. The next prime is 1621098158653. The reversal of 1621098158628 is 8268518901261.

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, 821640250 + ... + 821642222.

It is an arithmetic number, because the mean of its divisors is an integer number (11699976960).

Almost surely, 2^{1621098158628} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1621098158628, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2246395576320).

1621098158628 is an abundant number, since it is smaller than the sum of its proper divisors (2871692994012).

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

1621098158628 is a wasteful number, since it uses less digits than its factorization.

1621098158628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2219 (or 2217 counting only the distinct ones).

The product of its (nonzero) digits is 3317760, while the sum is 57.

The spelling of 1621098158628 in words is "one trillion, six hundred twenty-one billion, ninety-eight million, one hundred fifty-eight thousand, six hundred twenty-eight".