10661515651 has 4 divisors (see below), whose sum is σ = 10729423552. Its totient is φ = 10593607752.

The previous prime is 10661515549. The next prime is 10661515687. The reversal of 10661515651 is 15651516601.

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

It is a cyclic number.

It is not a de Polignac number, because 10661515651 - 2²¹ = 10659418499 is a prime.

It is a super-2 number, since 2×10661515651² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 10661515651.

It is not an unprimeable number, because it can be changed into a prime (10661519651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33953715 + ... + 33954028.

It is an arithmetic number, because the mean of its divisors is an integer number (2682355888).

Almost surely, 2^10661515651 is an apocalyptic number.

10661515651 is a deficient number, since it is larger than the sum of its proper divisors (67907901).

10661515651 is an equidigital number, since it uses as much as digits as its factorization.

10661515651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67907900.

The product of its (nonzero) digits is 27000, while the sum is 37.

The spelling of 10661515651 in words is "ten billion, six hundred sixty-one million, five hundred fifteen thousand, six hundred fifty-one".