646242476520 has 64 divisors (see below), whose sum is σ = 1938860763840. Its totient is φ = 172319475200.

The previous prime is 646242476519. The next prime is 646242476567. The reversal of 646242476520 is 25674242646.

646242476520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 646242476520.

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, 1641715 + ... + 1996925.

It is an arithmetic number, because the mean of its divisors is an integer number (30294699435).

Almost surely, 2^646242476520 is an apocalyptic number.

646242476520 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

646242476520 is an abundant number, since it is smaller than the sum of its proper divisors (1292618287320).

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

646242476520 is a wasteful number, since it uses less digits than its factorization.

646242476520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370386 (or 370382 counting only the distinct ones).

The product of its (nonzero) digits is 3870720, while the sum is 48.

The spelling of 646242476520 in words is "six hundred forty-six billion, two hundred forty-two million, four hundred seventy-six thousand, five hundred twenty".