7538668786781 has 16 divisors (see below), whose sum is σ = 8253397817280. Its totient is φ = 6828840981120.

The previous prime is 7538668786711. The next prime is 7538668786799. The reversal of 7538668786781 is 1876878668357.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7538668786781 is a prime.

It is a super-2 number, since 2×7538668786781² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 7538668786696 and 7538668786705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7538668786711) 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, 152478041 + ... + 152527473.

It is an arithmetic number, because the mean of its divisors is an integer number (515837363580).

Almost surely, 2^{7538668786781} is an apocalyptic number.

It is an amenable number.

7538668786781 is a deficient number, since it is larger than the sum of its proper divisors (714729030499).

7538668786781 is a wasteful number, since it uses less digits than its factorization.

7538668786781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98716.

The product of its digits is 4551966720, while the sum is 80.

The spelling of 7538668786781 in words is "seven trillion, five hundred thirty-eight billion, six hundred sixty-eight million, seven hundred eighty-six thousand, seven hundred eighty-one".