265645661560642 has 16 divisors (see below), whose sum is σ = 435402024576192. Its totient is φ = 120551049137520.

The previous prime is 265645661560603. The next prime is 265645661560679. The reversal of 265645661560642 is 246065166546562.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9848928438 + ... + 9848955409.

It is an arithmetic number, because the mean of its divisors is an integer number (27212626536012).

Almost surely, 2^{265645661560642} is an apocalyptic number.

265645661560642 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

265645661560642 is a deficient number, since it is larger than the sum of its proper divisors (169756363015550).

265645661560642 is a wasteful number, since it uses less digits than its factorization.

265645661560642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19697884473.

The product of its (nonzero) digits is 373248000, while the sum is 64.

The spelling of 265645661560642 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-two".