1617170085491 has 2 divisors, whose sum is σ = 1617170085492. Its totient is φ = 1617170085490.

The previous prime is 1617170085467. The next prime is 1617170085593. The reversal of 1617170085491 is 1945800717161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1617170085491 - 2²⁶ = 1617102976627 is a prime.

It is a super-2 number, since 2×1617170085491² (a number of 25 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1617170085431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 808585042745 + 808585042746.

It is an arithmetic number, because the mean of its divisors is an integer number (808585042746).

Almost surely, 2^{1617170085491} is an apocalyptic number.

1617170085491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1617170085491 is an equidigital number, since it uses as much as digits as its factorization.

1617170085491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 423360, while the sum is 50.

The spelling of 1617170085491 in words is "one trillion, six hundred seventeen billion, one hundred seventy million, eighty-five thousand, four hundred ninety-one".