1664566621311 has 16 divisors (see below), whose sum is σ = 2429804153088. Its totient is φ = 1005238113600.

The previous prime is 1664566621307. The next prime is 1664566621327. The reversal of 1664566621311 is 1131266654661.

It is not a de Polignac number, because 1664566621311 - 2² = 1664566621307 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664566621351) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89744131 + ... + 89762676.

It is an arithmetic number, because the mean of its divisors is an integer number (151862759568).

Almost surely, 2^{1664566621311} is an apocalyptic number.

1664566621311 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1664566621311 is a deficient number, since it is larger than the sum of its proper divisors (765237531777).

1664566621311 is a wasteful number, since it uses less digits than its factorization.

1664566621311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179507102.

The product of its digits is 933120, while the sum is 48.

The spelling of 1664566621311 in words is "one trillion, six hundred sixty-four billion, five hundred sixty-six million, six hundred twenty-one thousand, three hundred eleven".