16656344661 has 24 divisors (see below), whose sum is σ = 25695748960. Its totient is φ = 9563447520.

The previous prime is 16656344657. The next prime is 16656344717. The reversal of 16656344661 is 16644365661.

It is not a de Polignac number, because 16656344661 - 2² = 16656344657 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16656344661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16656344161) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1200610 + ... + 1214403.

Almost surely, 2^16656344661 is an apocalyptic number.

16656344661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16656344661 is a deficient number, since it is larger than the sum of its proper divisors (9039404299).

16656344661 is a wasteful number, since it uses less digits than its factorization.

16656344661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2415057 (or 2415046 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 48.

The spelling of 16656344661 in words is "sixteen billion, six hundred fifty-six million, three hundred forty-four thousand, six hundred sixty-one".