265645661560643 has 32 divisors (see below), whose sum is σ = 337497440071680. Its totient is φ = 203399814199680.

The previous prime is 265645661560603. The next prime is 265645661560679. The reversal of 265645661560643 is 346065166546562.

It is not a de Polignac number, because 265645661560643 - 2²⁶ = 265645594451779 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 265645661560643.

It is not an unprimeable number, because it can be changed into a prime (265645661560603) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 795205493 + ... + 795539481.

It is an arithmetic number, because the mean of its divisors is an integer number (10546795002240).

Almost surely, 2^{265645661560643} is an apocalyptic number.

265645661560643 is a deficient number, since it is larger than the sum of its proper divisors (71851778511037).

265645661560643 is a wasteful number, since it uses less digits than its factorization.

265645661560643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 615987.

The product of its (nonzero) digits is 559872000, while the sum is 65.

The spelling of 265645661560643 in words is "two hundred sixty-five trillion, six hundred forty-five billion, six hundred sixty-one million, five hundred sixty thousand, six hundred forty-three".