620971220646 has 192 divisors, whose sum is σ = 1629980098560. Its totient is φ = 177399344808.

The previous prime is 620971220581. The next prime is 620971220659. The reversal of 620971220646 is 646022179026.

620971220646 is a `hidden beast` number, since 620 + 9 + 7 + 12 + 2 + 0 + 6 + 4 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 73509595 + ... + 73518041.

It is an arithmetic number, because the mean of its divisors is an integer number (8489479680).

Almost surely, 2^620971220646 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 620971220646, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (814990049280).

620971220646 is an abundant number, since it is smaller than the sum of its proper divisors (1009008877914).

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

620971220646 is an frugal number, since it uses more digits than its factorization.

620971220646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8505 (or 8459 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 45.

The spelling of 620971220646 in words is "six hundred twenty billion, nine hundred seventy-one million, two hundred twenty thousand, six hundred forty-six".