7801325787551 has 2 divisors, whose sum is σ = 7801325787552. Its totient is φ = 7801325787550.

The previous prime is 7801325787529. The next prime is 7801325787557. The reversal of 7801325787551 is 1557875231087.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7801325787551 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7801325787557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3900662893775 + 3900662893776.

It is an arithmetic number, because the mean of its divisors is an integer number (3900662893776).

Almost surely, 2^{7801325787551} is an apocalyptic number.

7801325787551 is a deficient number, since it is larger than the sum of its proper divisors (1).

7801325787551 is an equidigital number, since it uses as much as digits as its factorization.

7801325787551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16464000, while the sum is 59.

The spelling of 7801325787551 in words is "seven trillion, eight hundred one billion, three hundred twenty-five million, seven hundred eighty-seven thousand, five hundred fifty-one".