664561001511 has 12 divisors (see below), whose sum is σ = 1047187032840. Its totient is φ = 402764243280.

The previous prime is 664561001479. The next prime is 664561001537. The reversal of 664561001511 is 115100165466.

664561001511 is a `hidden beast` number, since 6 + 645 + 6 + 1 + 0 + 0 + 1 + 5 + 1 + 1 = 666.

664561001511 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 664561001511 - 2⁵ = 664561001479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664561001011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3356368596 + ... + 3356368793.

It is an arithmetic number, because the mean of its divisors is an integer number (87265586070).

Almost surely, 2^664561001511 is an apocalyptic number.

664561001511 is a deficient number, since it is larger than the sum of its proper divisors (382626031329).

664561001511 is a wasteful number, since it uses less digits than its factorization.

664561001511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6712737406 (or 6712737403 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

Adding to 664561001511 its reverse (115100165466), we get a palindrome (779661166977).

The spelling of 664561001511 in words is "six hundred sixty-four billion, five hundred sixty-one million, one thousand, five hundred eleven".