10661515213 has 4 divisors (see below), whose sum is σ = 10689646240. Its totient is φ = 10633384188.

The previous prime is 10661515171. The next prime is 10661515217. The reversal of 10661515213 is 31251516601.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 10661515213 - 2¹⁷ = 10661384141 is a prime.

It is a super-2 number, since 2×10661515213² (a number of 21 digits) contains 22 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 (10661515217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14064945 + ... + 14065702.

It is an arithmetic number, because the mean of its divisors is an integer number (2672411560).

Almost surely, 2^10661515213 is an apocalyptic number.

It is an amenable number.

10661515213 is a deficient number, since it is larger than the sum of its proper divisors (28131027).

10661515213 is an equidigital number, since it uses as much as digits as its factorization.

10661515213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28131026.

The product of its (nonzero) digits is 5400, while the sum is 31.

The spelling of 10661515213 in words is "ten billion, six hundred sixty-one million, five hundred fifteen thousand, two hundred thirteen".