664663177512245 has 8 divisors (see below), whose sum is σ = 797598275998680. Its totient is φ = 531728900020480.

The previous prime is 664663177512199. The next prime is 664663177512251. The reversal of 664663177512245 is 542215771366466.

It can be written as a sum of positive squares in 4 ways, for example, as 609138103729 + 664054039408516 = 780473^2 + 25769246^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-664663177512245 is a prime.

It is a congruent number.

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, 203466176 + ... + 206707065.

It is an arithmetic number, because the mean of its divisors is an integer number (99699784499835).

Almost surely, 2^{664663177512245} is an apocalyptic number.

It is an amenable number.

664663177512245 is a deficient number, since it is larger than the sum of its proper divisors (132935098486435).

664663177512245 is a wasteful number, since it uses less digits than its factorization.

664663177512245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410497335.

The product of its digits is 304819200, while the sum is 65.

The spelling of 664663177512245 in words is "six hundred sixty-four trillion, six hundred sixty-three billion, one hundred seventy-seven million, five hundred twelve thousand, two hundred forty-five".