10721666 has 8 divisors (see below), whose sum is σ = 16225164. Its totient is φ = 5313280.

The previous prime is 10721653. The next prime is 10721723. The reversal of 10721666 is 66612701.

It can be written as a sum of positive squares in 2 ways, for example, as 9211225 + 1510441 = 3035^2 + 1229^2 .

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

It is a super-2 number, since 2×10721666² = 229908243631112, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23495 + ... + 23946.

Almost surely, 2^10721666 is an apocalyptic number.

10721666 is a deficient number, since it is larger than the sum of its proper divisors (5503498).

10721666 is a wasteful number, since it uses less digits than its factorization.

10721666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47556.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 10721666 is about 3274.3955167328. The cubic root of 10721666 is about 220.5061760944.

The spelling of 10721666 in words is "ten million, seven hundred twenty-one thousand, six hundred sixty-six".