265999986320 has 80 divisors (see below), whose sum is σ = 672000084480. Its totient is φ = 97548364800.

The previous prime is 265999986281. The next prime is 265999986337. The reversal of 265999986320 is 23689999562.

It is a tau number, because it is divible by the number of its divisors (80).

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 15 ways as a sum of consecutive naturals, for example, 2775461 + ... + 2869700.

It is an arithmetic number, because the mean of its divisors is an integer number (8400001056).

Almost surely, 2^265999986320 is an apocalyptic number.

265999986320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

265999986320 is an abundant number, since it is smaller than the sum of its proper divisors (406000098160).

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

265999986320 is a wasteful number, since it uses less digits than its factorization.

265999986320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5645224 (or 5645218 counting only the distinct ones).

The product of its (nonzero) digits is 113374080, while the sum is 68.

The spelling of 265999986320 in words is "two hundred sixty-five billion, nine hundred ninety-nine million, nine hundred eighty-six thousand, three hundred twenty".