664561001622 has 32 divisors (see below), whose sum is σ = 1519024465152. Its totient is φ = 189871085664.

The previous prime is 664561001569. The next prime is 664561001623. The reversal of 664561001622 is 226100165466.

664561001622 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664561001623) 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, 2940793 + ... + 3158699.

It is an arithmetic number, because the mean of its divisors is an integer number (47469514536).

Almost surely, 2^664561001622 is an apocalyptic number.

664561001622 is an abundant number, since it is smaller than the sum of its proper divisors (854463463530).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

664561001622 is a wasteful number, since it uses less digits than its factorization.

664561001622 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290532.

The product of its (nonzero) digits is 103680, while the sum is 39.

The spelling of 664561001622 in words is "six hundred sixty-four billion, five hundred sixty-one million, one thousand, six hundred twenty-two".