266378643880 has 32 divisors (see below), whose sum is σ = 618685885440. Its totient is φ = 103114313280.

The previous prime is 266378643857. The next prime is 266378643901. The reversal of 266378643880 is 88346873662.

It is a super-3 number, since 3×266378643880³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 107409504 + ... + 107411983.

It is an arithmetic number, because the mean of its divisors is an integer number (19333933920).

Almost surely, 2^266378643880 is an apocalyptic number.

266378643880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

266378643880 is an abundant number, since it is smaller than the sum of its proper divisors (352307241560).

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

266378643880 is a wasteful number, since it uses less digits than its factorization.

266378643880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214821529 (or 214821525 counting only the distinct ones).

The product of its (nonzero) digits is 55738368, while the sum is 61.

The spelling of 266378643880 in words is "two hundred sixty-six billion, three hundred seventy-eight million, six hundred forty-three thousand, eight hundred eighty".