664402020442 has 16 divisors (see below), whose sum is σ = 1031013842760. Its totient is φ = 320731743808.

The previous prime is 664402020437. The next prime is 664402020523. The reversal of 664402020442 is 244020204466.

It can be written as a sum of positive squares in 4 ways, for example, as 650376118681 + 14025901761 = 806459^2 + 118431^2 .

It is a junction number, because it is equal to n+sod(n) for n = 664402020398 and 664402020407.

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, 1150428 + ... + 1628584.

Almost surely, 2^664402020442 is an apocalyptic number.

664402020442 is a deficient number, since it is larger than the sum of its proper divisors (366611822318).

664402020442 is a wasteful number, since it uses less digits than its factorization.

664402020442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 502145.

The product of its (nonzero) digits is 73728, while the sum is 34.

The spelling of 664402020442 in words is "six hundred sixty-four billion, four hundred two million, twenty thousand, four hundred forty-two".