262666111561 has 12 divisors (see below), whose sum is σ = 305743973520. Its totient is φ = 224999729640.

The previous prime is 262666111559. The next prime is 262666111571. The reversal of 262666111561 is 165111666262.

It is not a de Polignac number, because 262666111561 - 2¹ = 262666111559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (262666111571) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1620075 + ... + 1774816.

It is an arithmetic number, because the mean of its divisors is an integer number (25478664460).

Almost surely, 2^262666111561 is an apocalyptic number.

It is an amenable number.

262666111561 is a deficient number, since it is larger than the sum of its proper divisors (43077861959).

262666111561 is a wasteful number, since it uses less digits than its factorization.

262666111561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3396484 (or 3396477 counting only the distinct ones).

The product of its digits is 155520, while the sum is 43.

The spelling of 262666111561 in words is "two hundred sixty-two billion, six hundred sixty-six million, one hundred eleven thousand, five hundred sixty-one".