10661537 has 4 divisors (see below), whose sum is σ = 10681236. Its totient is φ = 10641840.

The previous prime is 10661507. The next prime is 10661543. The reversal of 10661537 is 73516601.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 73516601 = 47 ⋅1564183.

It can be written as a sum of positive squares in 2 ways, for example, as 3066001 + 7595536 = 1751^2 + 2756^2 .

It is a cyclic number.

It is not a de Polignac number, because 10661537 - 2⁸ = 10661281 is a prime.

It is a super-2 number, since 2×10661537² = 227336742404738, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10661507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9014 + ... + 10127.

It is an arithmetic number, because the mean of its divisors is an integer number (2670309).

Almost surely, 2^10661537 is an apocalyptic number.

It is an amenable number.

10661537 is a deficient number, since it is larger than the sum of its proper divisors (19699).

10661537 is an equidigital number, since it uses as much as digits as its factorization.

10661537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19698.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 10661537 is about 3265.2009126545. The cubic root of 10661537 is about 220.0931905471.

The spelling of 10661537 in words is "ten million, six hundred sixty-one thousand, five hundred thirty-seven".