161663461 has 2 divisors, whose sum is σ = 161663462. Its totient is φ = 161663460.

The previous prime is 161663449. The next prime is 161663473. The reversal of 161663461 is 164366161.

161663461 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (161663449) and next prime (161663473).

It can be written as a sum of positive squares in only one way, i.e., 160022500 + 1640961 = 12650^2 + 1281^2 .

It is a cyclic number.

It is not a de Polignac number, because 161663461 - 2²³ = 153274853 is a prime.

It is a super-2 number, since 2×161663461² = 52270149244997042, which contains 22 as substring.

It is equal to p_9062485 and since 161663461 and 9062485 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161663441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80831730 + 80831731.

It is an arithmetic number, because the mean of its divisors is an integer number (80831731).

Almost surely, 2^161663461 is an apocalyptic number.

It is an amenable number.

161663461 is a deficient number, since it is larger than the sum of its proper divisors (1).

161663461 is an equidigital number, since it uses as much as digits as its factorization.

161663461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 34.

The square root of 161663461 is about 12714.6946876439. The cubic root of 161663461 is about 544.7584272926.

The spelling of 161663461 in words is "one hundred sixty-one million, six hundred sixty-three thousand, four hundred sixty-one".