10012661 has 4 divisors (see below), whose sum is σ = 10019052. Its totient is φ = 10006272.

The previous prime is 10012649. The next prime is 10012699. The reversal of 10012661 is 16621001.

It is a happy number.

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: 16621001 = 761 ⋅21841.

It can be written as a sum of positive squares in 2 ways, for example, as 4490161 + 5522500 = 2119^2 + 2350^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10012661 is a prime.

It is a super-3 number, since 3×10012661³ (a number of 22 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10012621) 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, 935 + ... + 4571.

It is an arithmetic number, because the mean of its divisors is an integer number (2504763).

Almost surely, 2^10012661 is an apocalyptic number.

It is an amenable number.

10012661 is a deficient number, since it is larger than the sum of its proper divisors (6391).

10012661 is an equidigital number, since it uses as much as digits as its factorization.

10012661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6390.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 10012661 is about 3164.2789067969. The cubic root of 10012661 is about 215.5343549824.

Adding to 10012661 its reverse (16621001), we get a palindrome (26633662).

The spelling of 10012661 in words is "ten million, twelve thousand, six hundred sixty-one".