161667493 has 16 divisors (see below), whose sum is σ = 178516800. Its totient is φ = 145491840.

The previous prime is 161667463. The next prime is 161667503. The reversal of 161667493 is 394766161.

161667493 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 161667493 - 2²⁵ = 128113061 is a prime.

It is a super-2 number, since 2×161667493² = 52272756585810098, which 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 (161667403) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 99673 + ... + 101281.

It is an arithmetic number, because the mean of its divisors is an integer number (11157300).

Almost surely, 2^161667493 is an apocalyptic number.

161667493 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

161667493 is a deficient number, since it is larger than the sum of its proper divisors (16849307).

161667493 is a wasteful number, since it uses less digits than its factorization.

161667493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1812.

The product of its digits is 163296, while the sum is 43.

The square root of 161667493 is about 12714.8532433528. The cubic root of 161667493 is about 544.7629561406.

The spelling of 161667493 in words is "one hundred sixty-one million, six hundred sixty-seven thousand, four hundred ninety-three".