161667473 has 4 divisors (see below), whose sum is σ = 176364528. Its totient is φ = 146970420.

The previous prime is 161667463. The next prime is 161667503. The reversal of 161667473 is 374766161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161667473 is a prime.

It is a super-2 number, since 2×161667473² = 52272743652411458, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161667473.

It is not an unprimeable number, because it can be changed into a prime (161667403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7348511 + ... + 7348532.

It is an arithmetic number, because the mean of its divisors is an integer number (44091132).

Almost surely, 2^161667473 is an apocalyptic number.

It is an amenable number.

161667473 is a deficient number, since it is larger than the sum of its proper divisors (14697055).

161667473 is a wasteful number, since it uses less digits than its factorization.

161667473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14697054.

The product of its digits is 127008, while the sum is 41.

The square root of 161667473 is about 12714.8524568711. The cubic root of 161667473 is about 544.7629336763.

The spelling of 161667473 in words is "one hundred sixty-one million, six hundred sixty-seven thousand, four hundred seventy-three".