1966651 has 8 divisors (see below), whose sum is σ = 2019600. Its totient is φ = 1914528.

The previous prime is 1966619. The next prime is 1966663. The reversal of 1966651 is 1566691.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1966651 - 2⁵ = 1966619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1966681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9885 + ... + 10081.

It is an arithmetic number, because the mean of its divisors is an integer number (252450).

2^1966651 is an apocalyptic number.

1966651 is a deficient number, since it is larger than the sum of its proper divisors (52949).

1966651 is a wasteful number, since it uses less digits than its factorization.

1966651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413.

The product of its digits is 9720, while the sum is 34.

The square root of 1966651 is about 1402.3733454398. The cubic root of 1966651 is about 125.2878911073.

The spelling of 1966651 in words is "one million, nine hundred sixty-six thousand, six hundred fifty-one".