1681915435157 has 2 divisors, whose sum is σ = 1681915435158. Its totient is φ = 1681915435156.

The previous prime is 1681915435103. The next prime is 1681915435223. The reversal of 1681915435157 is 7515345191861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 978756041041 + 703159394116 = 989321^2 + 838546^2 .

It is a cyclic number.

It is not a de Polignac number, because 1681915435157 - 2¹² = 1681915431061 is a prime.

It is a super-2 number, since 2×1681915435157² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1681915435457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 840957717578 + 840957717579.

It is an arithmetic number, because the mean of its divisors is an integer number (840957717579).

Almost surely, 2^{1681915435157} is an apocalyptic number.

It is an amenable number.

1681915435157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1681915435157 is an equidigital number, since it uses as much as digits as its factorization.

1681915435157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4536000, while the sum is 56.

The spelling of 1681915435157 in words is "one trillion, six hundred eighty-one billion, nine hundred fifteen million, four hundred thirty-five thousand, one hundred fifty-seven".