221164601465 has 16 divisors (see below), whose sum is σ = 265959432720. Its totient is φ = 176557301760.

The previous prime is 221164601423. The next prime is 221164601491. The reversal of 221164601465 is 564106461122.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 600054016 + 220564547449 = 24496^2 + 469643^2 .

It is not a de Polignac number, because 221164601465 - 2¹² = 221164597369 is a prime.

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, 8912375 + ... + 8937155.

It is an arithmetic number, because the mean of its divisors is an integer number (16622464545).

Almost surely, 2^221164601465 is an apocalyptic number.

It is an amenable number.

221164601465 is a deficient number, since it is larger than the sum of its proper divisors (44794831255).

221164601465 is a wasteful number, since it uses less digits than its factorization.

221164601465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28492.

The product of its (nonzero) digits is 69120, while the sum is 38.

The spelling of 221164601465 in words is "two hundred twenty-one billion, one hundred sixty-four million, six hundred one thousand, four hundred sixty-five".