1617158758681 has 2 divisors, whose sum is σ = 1617158758682. Its totient is φ = 1617158758680.

The previous prime is 1617158758643. The next prime is 1617158758781. The reversal of 1617158758681 is 1868578517161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 922368160000 + 694790598681 = 960400^2 + 833541^2 .

It is a cyclic number.

It is not a de Polignac number, because 1617158758681 - 2¹³ = 1617158750489 is a prime.

It is a super-2 number, since 2×1617158758681² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1617158758381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 808579379340 + 808579379341.

It is an arithmetic number, because the mean of its divisors is an integer number (808579379341).

Almost surely, 2^{1617158758681} is an apocalyptic number.

It is an amenable number.

1617158758681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1617158758681 is an equidigital number, since it uses as much as digits as its factorization.

1617158758681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22579200, while the sum is 64.

The spelling of 1617158758681 in words is "one trillion, six hundred seventeen billion, one hundred fifty-eight million, seven hundred fifty-eight thousand, six hundred eighty-one".