7868666681533 has 6 divisors (see below), whose sum is σ = 9153346956126. Its totient is φ = 6744571441272.

The previous prime is 7868666681503. The next prime is 7868666681537. The reversal of 7868666681533 is 3351866668687.

It can be written as a sum of positive squares in only one way, i.e., 4285471339044 + 3583195342489 = 2070138^2 + 1892933^2 .

It is not a de Polignac number, because 7868666681533 - 2²¹ = 7868664584381 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 (7868666681537) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 80292517110 + ... + 80292517207.

It is an arithmetic number, because the mean of its divisors is an integer number (1525557826021).

Almost surely, 2^{7868666681533} is an apocalyptic number.

It is an amenable number.

7868666681533 is a deficient number, since it is larger than the sum of its proper divisors (1284680274593).

7868666681533 is a wasteful number, since it uses less digits than its factorization.

7868666681533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160585034331 (or 160585034324 counting only the distinct ones).

The product of its digits is 1254113280, while the sum is 73.

The spelling of 7868666681533 in words is "seven trillion, eight hundred sixty-eight billion, six hundred sixty-six million, six hundred eighty-one thousand, five hundred thirty-three".