640335021662 has 16 divisors (see below), whose sum is σ = 1113177987072. Its totient is φ = 270564093240.

The previous prime is 640335021653. The next prime is 640335021673. The reversal of 640335021662 is 266120533046.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 322099118 + ... + 322101105.

It is an arithmetic number, because the mean of its divisors is an integer number (69573624192).

Almost surely, 2^640335021662 is an apocalyptic number.

640335021662 is a deficient number, since it is larger than the sum of its proper divisors (472842965410).

640335021662 is a wasteful number, since it uses less digits than its factorization.

640335021662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 644200303.

The product of its (nonzero) digits is 155520, while the sum is 38.

The spelling of 640335021662 in words is "six hundred forty billion, three hundred thirty-five million, twenty-one thousand, six hundred sixty-two".