161451171571 has 4 divisors (see below), whose sum is σ = 161456815432. Its totient is φ = 161445527712.

The previous prime is 161451171547. The next prime is 161451171589. The reversal of 161451171571 is 175171154161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 175171154161 = 7517 ⋅23303333.

It is a cyclic number.

It is not a de Polignac number, because 161451171571 - 2⁷ = 161451171443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161451177571) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2778801 + ... + 2836306.

It is an arithmetic number, because the mean of its divisors is an integer number (40364203858).

Almost surely, 2^161451171571 is an apocalyptic number.

161451171571 is a deficient number, since it is larger than the sum of its proper divisors (5643861).

161451171571 is an equidigital number, since it uses as much as digits as its factorization.

161451171571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5643860.

The product of its digits is 29400, while the sum is 40.

The spelling of 161451171571 in words is "one hundred sixty-one billion, four hundred fifty-one million, one hundred seventy-one thousand, five hundred seventy-one".