10661532513 has 4 divisors (see below), whose sum is σ = 14215376688. Its totient is φ = 7107688340.

The previous prime is 10661532509. The next prime is 10661532521. The reversal of 10661532513 is 31523516601.

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 10661532513 - 2² = 10661532509 is a prime.

It is a super-2 number, since 2×10661532513² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (10661532503) 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, 1776922083 + ... + 1776922088.

It is an arithmetic number, because the mean of its divisors is an integer number (3553844172).

Almost surely, 2^10661532513 is an apocalyptic number.

It is an amenable number.

10661532513 is a deficient number, since it is larger than the sum of its proper divisors (3553844175).

10661532513 is an equidigital number, since it uses as much as digits as its factorization.

10661532513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3553844174.

The product of its (nonzero) digits is 16200, while the sum is 33.

It can be divided in two parts, 106615 and 32513, that added together give a triangular number (139128 = T₅₂₇).

The spelling of 10661532513 in words is "ten billion, six hundred sixty-one million, five hundred thirty-two thousand, five hundred thirteen".