16666668261 has 24 divisors (see below), whose sum is σ = 24621801984. Its totient is φ = 10858999200.

The previous prime is 16666668251. The next prime is 16666668283. The reversal of 16666668261 is 16286666661.

It is not a de Polignac number, because 16666668261 - 2¹³ = 16666660069 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16666668198 and 16666668207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16666668211) 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, 268420 + ... + 324626.

It is an arithmetic number, because the mean of its divisors is an integer number (1025908416).

Almost surely, 2^16666668261 is an apocalyptic number.

It is an amenable number.

16666668261 is a deficient number, since it is larger than the sum of its proper divisors (7955133723).

16666668261 is a wasteful number, since it uses less digits than its factorization.

16666668261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56961 (or 56958 counting only the distinct ones).

The product of its digits is 4478976, while the sum is 54.

The spelling of 16666668261 in words is "sixteen billion, six hundred sixty-six million, six hundred sixty-eight thousand, two hundred sixty-one".