7821335287145 has 16 divisors (see below), whose sum is σ = 9688463081472. Its totient is φ = 6055165212480.

The previous prime is 7821335287133. The next prime is 7821335287159. The reversal of 7821335287145 is 5417825331287.

It is a happy number.

It is not a de Polignac number, because 7821335287145 - 2¹² = 7821335283049 is a prime.

It is a super-3 number, since 3×7821335287145³ (a number of 40 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20003339 + ... + 20390591.

It is an arithmetic number, because the mean of its divisors is an integer number (605528942592).

Almost surely, 2^{7821335287145} is an apocalyptic number.

It is an amenable number.

7821335287145 is a deficient number, since it is larger than the sum of its proper divisors (1867127794327).

7821335287145 is a wasteful number, since it uses less digits than its factorization.

7821335287145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 517592.

The product of its digits is 11289600, while the sum is 56.

The spelling of 7821335287145 in words is "seven trillion, eight hundred twenty-one billion, three hundred thirty-five million, two hundred eighty-seven thousand, one hundred forty-five".