266646742440 has 64 divisors (see below), whose sum is σ = 861474096000. Its totient is φ = 65636120832.

The previous prime is 266646742429. The next prime is 266646742487. The reversal of 266646742440 is 44247646662.

It is a super-2 number, since 2×266646742440² (a number of 24 digits) contains 22 as substring.

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, 85462140 + ... + 85465259.

It is an arithmetic number, because the mean of its divisors is an integer number (13460532750).

Almost surely, 2^266646742440 is an apocalyptic number.

266646742440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

266646742440 is an abundant number, since it is smaller than the sum of its proper divisors (594827353560).

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

266646742440 is a wasteful number, since it uses less digits than its factorization.

266646742440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170927426 (or 170927422 counting only the distinct ones).

The product of its (nonzero) digits is 9289728, while the sum is 51.

The spelling of 266646742440 in words is "two hundred sixty-six billion, six hundred forty-six million, seven hundred forty-two thousand, four hundred forty".