1662661 has 24 divisors (see below), whose sum is σ = 2264192. Its totient is φ = 1188000.

The previous prime is 1662653. The next prime is 1662667.

1662661 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1662661 - 2³ = 1662653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1662667) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10936 + ... + 11086.

2^1662661 is an apocalyptic number.

1662661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1662661 is a deficient number, since it is larger than the sum of its proper divisors (601531).

1662661 is a wasteful number, since it uses less digits than its factorization.

1662661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193 (or 182 counting only the distinct ones).

The product of its digits is 2592, while the sum is 28.

The square root of 1662661 is about 1289.4421274334. The cubic root of 1662661 is about 118.4680490927.

The spelling of 1662661 in words is "one million, six hundred sixty-two thousand, six hundred sixty-one".