161403510493 has 2 divisors, whose sum is σ = 161403510494. Its totient is φ = 161403510492.

The previous prime is 161403510491. The next prime is 161403510503. The reversal of 161403510493 is 394015304161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 144549758809 + 16853751684 = 380197^2 + 129822^2 .

It is a cyclic number.

It is not a de Polignac number, because 161403510493 - 2¹ = 161403510491 is a prime.

It is a super-2 number, since 2×161403510493² (a number of 23 digits) contains 22 as substring.

Together with 161403510491, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161403510491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80701755246 + 80701755247.

It is an arithmetic number, because the mean of its divisors is an integer number (80701755247).

Almost surely, 2^161403510493 is an apocalyptic number.

It is an amenable number.

161403510493 is a deficient number, since it is larger than the sum of its proper divisors (1).

161403510493 is an equidigital number, since it uses as much as digits as its factorization.

161403510493 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 37.

The spelling of 161403510493 in words is "one hundred sixty-one billion, four hundred three million, five hundred ten thousand, four hundred ninety-three".