10661899 has 4 divisors (see below), whose sum is σ = 10717336. Its totient is φ = 10606464.

The previous prime is 10661897. The next prime is 10661921. The reversal of 10661899 is 99816601.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 10661899 - 2¹ = 10661897 is a prime.

It is a super-2 number, since 2×10661899² = 227352180572402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10661897) 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, 27429 + ... + 27814.

It is an arithmetic number, because the mean of its divisors is an integer number (2679334).

Almost surely, 2^10661899 is an apocalyptic number.

10661899 is a deficient number, since it is larger than the sum of its proper divisors (55437).

10661899 is an equidigital number, since it uses as much as digits as its factorization.

10661899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55436.

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 10661899 is about 3265.2563452201. The cubic root of 10661899 is about 220.0956815210.

The spelling of 10661899 in words is "ten million, six hundred sixty-one thousand, eight hundred ninety-nine".