621770841646 has 8 divisors (see below), whose sum is σ = 932666224680. Its totient is φ = 310882100088.

The previous prime is 621770841631. The next prime is 621770841649. The reversal of 621770841646 is 646148077126.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 621770841593 and 621770841602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621770841649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1419321 + ... + 1804996.

It is an arithmetic number, because the mean of its divisors is an integer number (116583278085).

Almost surely, 2^621770841646 is an apocalyptic number.

621770841646 is a deficient number, since it is larger than the sum of its proper divisors (310895383034).

621770841646 is a wasteful number, since it uses less digits than its factorization.

621770841646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3320738.

The product of its (nonzero) digits is 2709504, while the sum is 52.

The spelling of 621770841646 in words is "six hundred twenty-one billion, seven hundred seventy million, eight hundred forty-one thousand, six hundred forty-six".