621001916850 has 192 divisors, whose sum is σ = 1766806917120. Its totient is φ = 141403449600.

The previous prime is 621001916819. The next prime is 621001916863. The reversal of 621001916850 is 58619100126.

It is a junction number, because it is equal to n+sod(n) for n = 621001916799 and 621001916808.

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, 476593299 + ... + 476594601.

It is an arithmetic number, because the mean of its divisors is an integer number (9202119360).

Almost surely, 2^621001916850 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 621001916850, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (883403458560).

621001916850 is an abundant number, since it is smaller than the sum of its proper divisors (1145805000270).

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

621001916850 is a wasteful number, since it uses less digits than its factorization.

621001916850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2705 (or 2700 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 39.

The spelling of 621001916850 in words is "six hundred twenty-one billion, one million, nine hundred sixteen thousand, eight hundred fifty".