646502177850 has 24 divisors (see below), whose sum is σ = 1603325401440. Its totient is φ = 172400580720.

The previous prime is 646502177831. The next prime is 646502177857. The reversal of 646502177850 is 58771205646.

It is a junction number, because it is equal to n+sod(n) for n = 646502177793 and 646502177802.

It is not an unprimeable number, because it can be changed into a prime (646502177857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2155007110 + ... + 2155007409.

It is an arithmetic number, because the mean of its divisors is an integer number (66805225060).

Almost surely, 2^646502177850 is an apocalyptic number.

646502177850 is an abundant number, since it is smaller than the sum of its proper divisors (956823223590).

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

646502177850 is a wasteful number, since it uses less digits than its factorization.

646502177850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4310014534 (or 4310014529 counting only the distinct ones).

The product of its (nonzero) digits is 2822400, while the sum is 51.

The spelling of 646502177850 in words is "six hundred forty-six billion, five hundred two million, one hundred seventy-seven thousand, eight hundred fifty".