664472265473745 has 20 divisors (see below), whose sum is σ = 1191128061072180. Its totient is φ = 354385208252448.

The previous prime is 664472265473719. The next prime is 664472265473789. The reversal of 664472265473745 is 547374562274466.

It is a happy number.

664472265473745 is a `hidden beast` number, since 6 + 6 + 4 + 4 + 7 + 2 + 2 + 6 + 547 + 3 + 74 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 243959783500944 + 420512481972801 = 15619212^2 + 20506401^2 .

It is not a de Polignac number, because 664472265473745 - 2²³ = 664472257085137 is a prime.

It is a super-2 number, since 2×664472265473745² (a number of 30 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 820336129810 + ... + 820336130619.

It is an arithmetic number, because the mean of its divisors is an integer number (59556403053609).

Almost surely, 2^{664472265473745} is an apocalyptic number.

It is an amenable number.

664472265473745 is a deficient number, since it is larger than the sum of its proper divisors (526655795598435).

664472265473745 is a wasteful number, since it uses less digits than its factorization.

664472265473745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1640672260446 (or 1640672260437 counting only the distinct ones).

The product of its digits is 5689958400, while the sum is 72.

The spelling of 664472265473745 in words is "six hundred sixty-four trillion, four hundred seventy-two billion, two hundred sixty-five million, four hundred seventy-three thousand, seven hundred forty-five".