6245387857821 has 16 divisors (see below), whose sum is σ = 9524153174528. Its totient is φ = 3566028682800.

The previous prime is 6245387857817. The next prime is 6245387857823. The reversal of 6245387857821 is 1287587835426.

It is not a de Polignac number, because 6245387857821 - 2² = 6245387857817 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6245387857823) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 115154695 + ... + 115208916.

It is an arithmetic number, because the mean of its divisors is an integer number (595259573408).

Almost surely, 2^{6245387857821} is an apocalyptic number.

It is an amenable number.

6245387857821 is a deficient number, since it is larger than the sum of its proper divisors (3278765316707).

6245387857821 is a wasteful number, since it uses less digits than its factorization.

6245387857821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230364912.

The product of its digits is 180633600, while the sum is 66.

The spelling of 6245387857821 in words is "six trillion, two hundred forty-five billion, three hundred eighty-seven million, eight hundred fifty-seven thousand, eight hundred twenty-one".