664211634 has 16 divisors (see below), whose sum is σ = 1336575072. Its totient is φ = 220045248.

The previous prime is 664211629. The next prime is 664211663. The reversal of 664211634 is 436112466.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 664211595 and 664211604.

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, 338599 + ... + 340554.

It is an arithmetic number, because the mean of its divisors is an integer number (83535942).

Almost surely, 2^664211634 is an apocalyptic number.

664211634 is an abundant number, since it is smaller than the sum of its proper divisors (672363438).

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

664211634 is a wasteful number, since it uses less digits than its factorization.

664211634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 679321.

The product of its digits is 20736, while the sum is 33.

The square root of 664211634 is about 25772.3036222997. The cubic root of 664211634 is about 872.5068114399.

The spelling of 664211634 in words is "six hundred sixty-four million, two hundred eleven thousand, six hundred thirty-four".