664088627661 has 8 divisors (see below), whose sum is σ = 885473884224. Its totient is φ = 442714561440.

The previous prime is 664088627617. The next prime is 664088627669. The reversal of 664088627661 is 166726880466.

664088627661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 664088627661 - 2²¹ = 664086530509 is a prime.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 664088627595 and 664088627604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664088627669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2658120 + ... + 2897201.

It is an arithmetic number, because the mean of its divisors is an integer number (110684235528).

Almost surely, 2^664088627661 is an apocalyptic number.

It is an amenable number.

664088627661 is a deficient number, since it is larger than the sum of its proper divisors (221385256563).

664088627661 is a wasteful number, since it uses less digits than its factorization.

664088627661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5595171.

The product of its (nonzero) digits is 27869184, while the sum is 60.

The spelling of 664088627661 in words is "six hundred sixty-four billion, eighty-eight million, six hundred twenty-seven thousand, six hundred sixty-one".