10661213866 has 16 divisors (see below), whose sum is σ = 16087105440. Its totient is φ = 5298867760.

The previous prime is 10661213863. The next prime is 10661213881. The reversal of 10661213866 is 66831216601.

It is a super-2 number, since 2×10661213866² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (10661213863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1710636 + ... + 1716856.

It is an arithmetic number, because the mean of its divisors is an integer number (1005444090).

Almost surely, 2^10661213866 is an apocalyptic number.

10661213866 is a deficient number, since it is larger than the sum of its proper divisors (5425891574).

10661213866 is a wasteful number, since it uses less digits than its factorization.

10661213866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11189.

The product of its (nonzero) digits is 62208, while the sum is 40.

The spelling of 10661213866 in words is "ten billion, six hundred sixty-one million, two hundred thirteen thousand, eight hundred sixty-six".