640465020622 has 16 divisors (see below), whose sum is σ = 1097961078240. Its totient is φ = 274479748128.

The previous prime is 640465020617. The next prime is 640465020631. The reversal of 640465020622 is 226020564046.

640465020622 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 an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 369504 + ... + 1190572.

It is an arithmetic number, because the mean of its divisors is an integer number (68622567390).

Almost surely, 2^640465020622 is an apocalyptic number.

640465020622 is a deficient number, since it is larger than the sum of its proper divisors (457496057618).

640465020622 is a wasteful number, since it uses less digits than its factorization.

640465020622 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 876795.

The product of its (nonzero) digits is 138240, while the sum is 37.

Adding to 640465020622 its reverse (226020564046), we get a palindrome (866485584668).

The spelling of 640465020622 in words is "six hundred forty billion, four hundred sixty-five million, twenty thousand, six hundred twenty-two".