266206956840 has 192 divisors, whose sum is σ = 978781527360. Its totient is φ = 64534993920.

The previous prime is 266206956833. The next prime is 266206956871. The reversal of 266206956840 is 48659602662.

It is a happy number.

266206956840 is a `hidden beast` number, since 2 + 6 + 620 + 6 + 9 + 5 + 6 + 8 + 4 + 0 = 666.

It is a super-2 number, since 2×266206956840² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1137969 + ... + 1351808.

It is an arithmetic number, because the mean of its divisors is an integer number (5097820455).

Almost surely, 2^266206956840 is an apocalyptic number.

266206956840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

266206956840 is an abundant number, since it is smaller than the sum of its proper divisors (712574570520).

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

266206956840 is a wasteful number, since it uses less digits than its factorization.

266206956840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2489814 (or 2489798 counting only the distinct ones).

The product of its (nonzero) digits is 7464960, while the sum is 54.

The spelling of 266206956840 in words is "two hundred sixty-six billion, two hundred six million, nine hundred fifty-six thousand, eight hundred forty".