1660567 has 4 divisors (see below), whose sum is σ = 1663200. Its totient is φ = 1657936.

The previous prime is 1660559. The next prime is 1660573. The reversal of 1660567 is 7650661.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 7650661 = 229 ⋅33409.

It is a cyclic number.

It is not a de Polignac number, because 1660567 - 2³ = 1660559 is a prime.

It is a super-2 number, since 2×1660567² = 5514965522978, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1660507) 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, 258 + ... + 1840.

It is an arithmetic number, because the mean of its divisors is an integer number (415800).

2^1660567 is an apocalyptic number.

1660567 is a deficient number, since it is larger than the sum of its proper divisors (2633).

1660567 is a wasteful number, since it uses less digits than its factorization.

1660567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2632.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 1660567 is about 1288.6298925603. The cubic root of 1660567 is about 118.4182942498.

The spelling of 1660567 in words is "one million, six hundred sixty thousand, five hundred sixty-seven".