265645652025506 has 4 divisors (see below), whose sum is σ = 398468478038262. Its totient is φ = 132822826012752.

The previous prime is 265645652025491. The next prime is 265645652025521. The reversal of 265645652025506 is 605520256546562.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (265645652025491) and next prime (265645652025521).

It can be written as a sum of positive squares in only one way, i.e., 260036878184281 + 5608773841225 = 16125659^2 + 2368285^2 .

It is a super-2 number, since 2×265645652025506² (a number of 30 digits) contains 22 as substring.

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 as a sum of consecutive naturals, namely, 66411413006375 + ... + 66411413006378.

Almost surely, 2^{265645652025506} is an apocalyptic number.

265645652025506 is a deficient number, since it is larger than the sum of its proper divisors (132822826012756).

265645652025506 is a wasteful number, since it uses less digits than its factorization.

265645652025506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132822826012755.

The product of its (nonzero) digits is 129600000, while the sum is 59.

The spelling of 265645652025506 in words is "two hundred sixty-five trillion, six hundred forty-five billion, six hundred fifty-two million, twenty-five thousand, five hundred six".