507781096406917 has 2 divisors, whose sum is σ = 507781096406918. Its totient is φ = 507781096406916.

The previous prime is 507781096406867. The next prime is 507781096406929. The reversal of 507781096406917 is 719604690187705.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 384132011709796 + 123649084697121 = 19599286^2 + 11119761^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-507781096406917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (507781096406317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 253890548203458 + 253890548203459.

It is an arithmetic number, because the mean of its divisors is an integer number (253890548203459).

Almost surely, 2^{507781096406917} is an apocalyptic number.

It is an amenable number.

507781096406917 is a deficient number, since it is larger than the sum of its proper divisors (1).

507781096406917 is an equidigital number, since it uses as much as digits as its factorization.

507781096406917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 160030080, while the sum is 70.

The spelling of 507781096406917 in words is "five hundred seven trillion, seven hundred eighty-one billion, ninety-six million, four hundred six thousand, nine hundred seventeen".