646406229810 has 32 divisors (see below), whose sum is σ = 1692409038912. Its totient is φ = 156704540480.

The previous prime is 646406229793. The next prime is 646406229857. The reversal of 646406229810 is 18922604646.

It is a super-2 number, since 2×646406229810² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 646406229810.

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, 979403049 + ... + 979403708.

It is an arithmetic number, because the mean of its divisors is an integer number (52887782466).

Almost surely, 2^646406229810 is an apocalyptic number.

646406229810 is an abundant number, since it is smaller than the sum of its proper divisors (1046002809102).

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

646406229810 is a wasteful number, since it uses less digits than its factorization.

646406229810 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1958806778.

The product of its (nonzero) digits is 995328, while the sum is 48.

The spelling of 646406229810 in words is "six hundred forty-six billion, four hundred six million, two hundred twenty-nine thousand, eight hundred ten".