16861653866 has 16 divisors (see below), whose sum is σ = 25339596768. Its totient is φ = 8415138000.

The previous prime is 16861653863. The next prime is 16861653869. The reversal of 16861653866 is 66835616861.

It is an interprime number because it is at equal distance from previous prime (16861653863) and next prime (16861653869).

It is not an unprimeable number, because it can be changed into a prime (16861653863) 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, 2954816 + ... + 2960516.

It is an arithmetic number, because the mean of its divisors is an integer number (1583724798).

Almost surely, 2^16861653866 is an apocalyptic number.

16861653866 is a deficient number, since it is larger than the sum of its proper divisors (8477942902).

16861653866 is a wasteful number, since it uses less digits than its factorization.

16861653866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8197.

The product of its digits is 7464960, while the sum is 56.

The spelling of 16861653866 in words is "sixteen billion, eight hundred sixty-one million, six hundred fifty-three thousand, eight hundred sixty-six".