266121767540 has 48 divisors (see below), whose sum is σ = 591778317312. Its totient is φ = 100178766336.

The previous prime is 266121767537. The next prime is 266121767573. The reversal of 266121767540 is 45767121662.

It is a super-2 number, since 2×266121767540² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5491697 + ... + 5539943.

It is an arithmetic number, because the mean of its divisors is an integer number (12328714944).

Almost surely, 2^266121767540 is an apocalyptic number.

266121767540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

266121767540 is an abundant number, since it is smaller than the sum of its proper divisors (325656549772).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

266121767540 is a wasteful number, since it uses less digits than its factorization.

266121767540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64496 (or 64494 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 47.

The spelling of 266121767540 in words is "two hundred sixty-six billion, one hundred twenty-one million, seven hundred sixty-seven thousand, five hundred forty".