266512503640 has 32 divisors (see below), whose sum is σ = 599668272000. Its totient is φ = 106602310144.

The previous prime is 266512503623. The next prime is 266512503641. The reversal of 266512503640 is 46305215662.

It is a happy number.

It is a super-2 number, since 2×266512503640² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 266512503593 and 266512503602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266512503641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2501376 + ... + 2605744.

It is an arithmetic number, because the mean of its divisors is an integer number (18739633500).

Almost surely, 2^266512503640 is an apocalyptic number.

266512503640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

266512503640 is an abundant number, since it is smaller than the sum of its proper divisors (333155768360).

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

266512503640 is a wasteful number, since it uses less digits than its factorization.

266512503640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168219 (or 168215 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 40.

The spelling of 266512503640 in words is "two hundred sixty-six billion, five hundred twelve million, five hundred three thousand, six hundred forty".