646151662797120 has 448 divisors, whose sum is σ = 2399916949305600. Its totient is φ = 163206689218560.

The previous prime is 646151662797097. The next prime is 646151662797133. The reversal of 646151662797120 is 21797266151646.

646151662797120 is a `hidden beast` number, since 6 + 4 + 6 + 1 + 516 + 6 + 2 + 7 + 97 + 1 + 20 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 852760830 + ... + 853518210.

Almost surely, 2^{646151662797120} is an apocalyptic number.

646151662797120 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 646151662797120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1199958474652800).

646151662797120 is an abundant number, since it is smaller than the sum of its proper divisors (1753765286508480).

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

646151662797120 is a wasteful number, since it uses less digits than its factorization.

646151662797120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 762623 (or 762607 counting only the distinct ones).

The product of its (nonzero) digits is 45722880, while the sum is 63.

The spelling of 646151662797120 in words is "six hundred forty-six trillion, one hundred fifty-one billion, six hundred sixty-two million, seven hundred ninety-seven thousand, one hundred twenty".