664242220446 has 32 divisors (see below), whose sum is σ = 1518420583680. Its totient is φ = 189764410176.

The previous prime is 664242220417. The next prime is 664242220459. The reversal of 664242220446 is 644022242466.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 664242220398 and 664242220407.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 369676 + ... + 1210431.

It is an arithmetic number, because the mean of its divisors is an integer number (47450643240).

Almost surely, 2^664242220446 is an apocalyptic number.

664242220446 is an abundant number, since it is smaller than the sum of its proper divisors (854178363234).

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

664242220446 is a wasteful number, since it uses less digits than its factorization.

664242220446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1590128.

The product of its (nonzero) digits is 884736, while the sum is 42.

The spelling of 664242220446 in words is "six hundred sixty-four billion, two hundred forty-two million, two hundred twenty thousand, four hundred forty-six".