265542980640 has 96 divisors (see below), whose sum is σ = 955954742400. Its totient is φ = 60695537664.

The previous prime is 265542980639. The next prime is 265542980641. The reversal of 265542980640 is 46089245562.

It is an interprime number because it is at equal distance from previous prime (265542980639) and next prime (265542980641).

It is a tau number, because it is divible by the number of its divisors (96).

It is not an unprimeable number, because it can be changed into a prime (265542980641) 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 15 ways as a sum of consecutive naturals, for example, 39511965 + ... + 39518684.

It is an arithmetic number, because the mean of its divisors is an integer number (9957861900).

Almost surely, 2^265542980640 is an apocalyptic number.

265542980640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

265542980640 is an abundant number, since it is smaller than the sum of its proper divisors (690411761760).

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

265542980640 is a wasteful number, since it uses less digits than its factorization.

265542980640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79030674 (or 79030666 counting only the distinct ones).

The product of its (nonzero) digits is 4147200, while the sum is 51.

The spelling of 265542980640 in words is "two hundred sixty-five billion, five hundred forty-two million, nine hundred eighty thousand, six hundred forty".