6845157645821 has 16 divisors (see below), whose sum is σ = 7499617668288. Its totient is φ = 6196079923200.

The previous prime is 6845157645811. The next prime is 6845157645839. The reversal of 6845157645821 is 1285467515486.

It is a happy number.

6845157645821 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 6845157645821 - 2¹⁰ = 6845157644797 is a prime.

It is a super-2 number, since 2×6845157645821² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6845157645811) 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, 6313751 + ... + 7318043.

It is an arithmetic number, because the mean of its divisors is an integer number (468726104268).

Almost surely, 2^{6845157645821} is an apocalyptic number.

It is an amenable number.

6845157645821 is a deficient number, since it is larger than the sum of its proper divisors (654460022467).

6845157645821 is a wasteful number, since it uses less digits than its factorization.

6845157645821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1006972.

The product of its digits is 64512000, while the sum is 62.

The spelling of 6845157645821 in words is "six trillion, eight hundred forty-five billion, one hundred fifty-seven million, six hundred forty-five thousand, eight hundred twenty-one".