161506770167 has 4 divisors (see below), whose sum is σ = 161576658576. Its totient is φ = 161436881760.

The previous prime is 161506770149. The next prime is 161506770181. The reversal of 161506770167 is 761077605161.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 161506770167 - 2²² = 161502575863 is a prime.

It is a super-2 number, since 2×161506770167² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161506740167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34940738 + ... + 34945359.

It is an arithmetic number, because the mean of its divisors is an integer number (40394164644).

Almost surely, 2^161506770167 is an apocalyptic number.

161506770167 is a deficient number, since it is larger than the sum of its proper divisors (69888409).

161506770167 is an equidigital number, since it uses as much as digits as its factorization.

161506770167 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69888408.

The product of its (nonzero) digits is 370440, while the sum is 47.

The spelling of 161506770167 in words is "one hundred sixty-one billion, five hundred six million, seven hundred seventy thousand, one hundred sixty-seven".