161526553 has 2 divisors, whose sum is σ = 161526554. Its totient is φ = 161526552.

The previous prime is 161526529. The next prime is 161526583. The reversal of 161526553 is 355625161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 149499529 + 12027024 = 12227^2 + 3468^2 .

It is a cyclic number.

It is not a de Polignac number, because 161526553 - 2¹³ = 161518361 is a prime.

It is not a weakly prime, because it can be changed into another prime (161526583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80763276 + 80763277.

It is an arithmetic number, because the mean of its divisors is an integer number (80763277).

Almost surely, 2^161526553 is an apocalyptic number.

It is an amenable number.

161526553 is a deficient number, since it is larger than the sum of its proper divisors (1).

161526553 is an equidigital number, since it uses as much as digits as its factorization.

161526553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27000, while the sum is 34.

The square root of 161526553 is about 12709.3096980127. The cubic root of 161526553 is about 544.6046039324.

The spelling of 161526553 in words is "one hundred sixty-one million, five hundred twenty-six thousand, five hundred fifty-three".