621640266431016 has 128 divisors (see below), whose sum is σ = 1802090396252160. Its totient is φ = 175016635449600.

The previous prime is 621640266431011. The next prime is 621640266431027. The reversal of 621640266431016 is 610134662046126.

It is not an unprimeable number, because it can be changed into a prime (621640266431011) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8506051 + ... + 36271661.

It is an arithmetic number, because the mean of its divisors is an integer number (14078831220720).

Almost surely, 2^{621640266431016} 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 621640266431016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (901045198126080).

621640266431016 is an abundant number, since it is smaller than the sum of its proper divisors (1180450129821144).

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

621640266431016 is a wasteful number, since it uses less digits than its factorization.

621640266431016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27767575 (or 27767571 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 48.

The spelling of 621640266431016 in words is "six hundred twenty-one trillion, six hundred forty billion, two hundred sixty-six million, four hundred thirty-one thousand, sixteen".