10661090497 has 4 divisors (see below), whose sum is σ = 10949228116. Its totient is φ = 10372952880.

The previous prime is 10661090471. The next prime is 10661090501. The reversal of 10661090497 is 79409016601.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9419867136 + 1241223361 = 97056^2 + 35231^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10661090497 is a prime.

It is a super-2 number, since 2×10661090497² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10661090467) 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, 144068754 + ... + 144068827.

It is an arithmetic number, because the mean of its divisors is an integer number (2737307029).

Almost surely, 2^10661090497 is an apocalyptic number.

It is an amenable number.

10661090497 is a deficient number, since it is larger than the sum of its proper divisors (288137619).

10661090497 is an equidigital number, since it uses as much as digits as its factorization.

10661090497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288137618.

The product of its (nonzero) digits is 81648, while the sum is 43.

The spelling of 10661090497 in words is "ten billion, six hundred sixty-one million, ninety thousand, four hundred ninety-seven".