266137242731661 has 8 divisors (see below), whose sum is σ = 405542465114944. Its totient is φ = 152078424418080.

The previous prime is 266137242731653. The next prime is 266137242731741. The reversal of 266137242731661 is 166137242731662.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 266137242731661 - 2³ = 266137242731653 is a prime.

It is a super-2 number, since 2×266137242731661² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266137242731651) 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, 6336601017400 + ... + 6336601017441.

It is an arithmetic number, because the mean of its divisors is an integer number (50692808139368).

Almost surely, 2^{266137242731661} is an apocalyptic number.

266137242731661 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

266137242731661 is a deficient number, since it is larger than the sum of its proper divisors (139405222383283).

266137242731661 is a wasteful number, since it uses less digits than its factorization.

266137242731661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12673202034851.

The product of its digits is 18289152, while the sum is 57.

Subtracting from 266137242731661 its reverse (166137242731662), we obtain a palindrome (99999999999999).

The spelling of 266137242731661 in words is "two hundred sixty-six trillion, one hundred thirty-seven billion, two hundred forty-two million, seven hundred thirty-one thousand, six hundred sixty-one".