646166401240 has 32 divisors (see below), whose sum is σ = 1530394110000. Its totient is φ = 244863057024.

The previous prime is 646166401217. The next prime is 646166401327. The reversal of 646166401240 is 42104661646.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 646166401193 and 646166401202.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 425108715 + ... + 425110234.

Almost surely, 2^646166401240 is an apocalyptic number.

It is an amenable number.

646166401240 is an abundant number, since it is smaller than the sum of its proper divisors (884227708760).

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

646166401240 is a wasteful number, since it uses less digits than its factorization.

646166401240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 850218979 (or 850218975 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 40.

The spelling of 646166401240 in words is "six hundred forty-six billion, one hundred sixty-six million, four hundred one thousand, two hundred forty".