161451171547 has 2 divisors, whose sum is σ = 161451171548. Its totient is φ = 161451171546.

The previous prime is 161451171487. The next prime is 161451171589. The reversal of 161451171547 is 745171154161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161451171547 - 2³⁵ = 127091433179 is a prime.

It is not a weakly prime, because it can be changed into another prime (161451171247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80725585773 + 80725585774.

It is an arithmetic number, because the mean of its divisors is an integer number (80725585774).

Almost surely, 2^161451171547 is an apocalyptic number.

161451171547 is a deficient number, since it is larger than the sum of its proper divisors (1).

161451171547 is an equidigital number, since it uses as much as digits as its factorization.

161451171547 is an evil number, because the sum of its binary digits is even.

The product of its digits is 117600, while the sum is 43.

The spelling of 161451171547 in words is "one hundred sixty-one billion, four hundred fifty-one million, one hundred seventy-one thousand, five hundred forty-seven".