646206231156 has 24 divisors (see below), whose sum is σ = 1539895701120. Its totient is φ = 210819053952.

The previous prime is 646206231061. The next prime is 646206231193. The reversal of 646206231156 is 651132602646.

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, 572877301 + ... + 572878428.

It is an arithmetic number, because the mean of its divisors is an integer number (64162320880).

Almost surely, 2^646206231156 is an apocalyptic number.

It is an amenable number.

646206231156 is an abundant number, since it is smaller than the sum of its proper divisors (893689469964).

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

646206231156 is a wasteful number, since it uses less digits than its factorization.

646206231156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1145755783 (or 1145755781 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 42.

The spelling of 646206231156 in words is "six hundred forty-six billion, two hundred six million, two hundred thirty-one thousand, one hundred fifty-six".