10215630556661 has 4 divisors (see below), whose sum is σ = 10491728679852. Its totient is φ = 9939532433472.

The previous prime is 10215630556643. The next prime is 10215630556667. The reversal of 10215630556661 is 16665503651201.

10215630556661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 8280524208100 + 1935106348561 = 2877590^2 + 1391081^2 .

It is a cyclic number.

It is not a de Polignac number, because 10215630556661 - 2³⁰ = 10214556814837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10215630556667) 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, 138049061540 + ... + 138049061613.

It is an arithmetic number, because the mean of its divisors is an integer number (2622932169963).

Almost surely, 2^{10215630556661} is an apocalyptic number.

It is an amenable number.

10215630556661 is a deficient number, since it is larger than the sum of its proper divisors (276098123191).

10215630556661 is an equidigital number, since it uses as much as digits as its factorization.

10215630556661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276098123190.

The product of its (nonzero) digits is 972000, while the sum is 47.

The spelling of 10215630556661 in words is "ten trillion, two hundred fifteen billion, six hundred thirty million, five hundred fifty-six thousand, six hundred sixty-one".