6421966522940 has 24 divisors (see below), whose sum is σ = 14072483164320. Its totient is φ = 2457100234688.

The previous prime is 6421966522913. The next prime is 6421966522957. The reversal of 6421966522940 is 492256691246.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6980397935 + ... + 6980398854.

It is an arithmetic number, because the mean of its divisors is an integer number (586353465180).

Almost surely, 2^{6421966522940} is an apocalyptic number.

It is an amenable number.

6421966522940 is an abundant number, since it is smaller than the sum of its proper divisors (7650516641380).

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

6421966522940 is a wasteful number, since it uses less digits than its factorization.

6421966522940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13960796821 (or 13960796819 counting only the distinct ones).

The product of its (nonzero) digits is 11197440, while the sum is 56.

The spelling of 6421966522940 in words is "six trillion, four hundred twenty-one billion, nine hundred sixty-six million, five hundred twenty-two thousand, nine hundred forty".