10661532997 has 2 divisors, whose sum is σ = 10661532998. Its totient is φ = 10661532996.

The previous prime is 10661532971. The next prime is 10661533039. The reversal of 10661532997 is 79923516601.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10643842561 + 17690436 = 103169^2 + 4206^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10661532997 is a prime.

It is a super-2 number, since 2×10661532997² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 10661532997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10661532097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5330766498 + 5330766499.

It is an arithmetic number, because the mean of its divisors is an integer number (5330766499).

Almost surely, 2^10661532997 is an apocalyptic number.

It is an amenable number.

10661532997 is a deficient number, since it is larger than the sum of its proper divisors (1).

10661532997 is an equidigital number, since it uses as much as digits as its factorization.

10661532997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 612360, while the sum is 49.

The spelling of 10661532997 in words is "ten billion, six hundred sixty-one million, five hundred thirty-two thousand, nine hundred ninety-seven".