221636770132565 has 16 divisors (see below), whose sum is σ = 273110994856128. Its totient is φ = 172573976808576.

The previous prime is 221636770132541. The next prime is 221636770132763. The reversal of 221636770132565 is 565231077636122.

It is a cyclic number.

It is not a de Polignac number, because 221636770132565 - 2⁶ = 221636770132501 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221636770132565.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1821261944 + ... + 1821383633.

It is an arithmetic number, because the mean of its divisors is an integer number (17069437178508).

Almost surely, 2^{221636770132565} is an apocalyptic number.

It is an amenable number.

221636770132565 is a deficient number, since it is larger than the sum of its proper divisors (51474224723563).

221636770132565 is a wasteful number, since it uses less digits than its factorization.

221636770132565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3642645908.

The product of its (nonzero) digits is 19051200, while the sum is 56.

The spelling of 221636770132565 in words is "two hundred twenty-one trillion, six hundred thirty-six billion, seven hundred seventy million, one hundred thirty-two thousand, five hundred sixty-five".