10661360556631 has 4 divisors (see below), whose sum is σ = 10661368380264. Its totient is φ = 10661352733000.

The previous prime is 10661360556527. The next prime is 10661360556643. The reversal of 10661360556631 is 13665506316601.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 10661360556631 - 2¹³ = 10661360548439 is a prime.

It is a super-2 number, since 2×10661360556631² (a number of 27 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10661360556731) 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, 1275520 + ... + 4790581.

It is an arithmetic number, because the mean of its divisors is an integer number (2665342095066).

Almost surely, 2^{10661360556631} is an apocalyptic number.

10661360556631 is a deficient number, since it is larger than the sum of its proper divisors (7823633).

10661360556631 is an equidigital number, since it uses as much as digits as its factorization.

10661360556631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7823632.

The product of its (nonzero) digits is 1749600, while the sum is 49.

The spelling of 10661360556631 in words is "ten trillion, six hundred sixty-one billion, three hundred sixty million, five hundred fifty-six thousand, six hundred thirty-one".