646285977792 has 560 divisors, whose sum is σ = 2365189307712. Its totient is φ = 169922396160.

The previous prime is 646285977763. The next prime is 646285977803. The reversal of 646285977792 is 297779582646.

646285977792 is a `hidden beast` number, since 6 + 4 + 6 + 28 + 597 + 7 + 7 + 9 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a self number, because there is not a number n which added to its sum of digits gives 646285977792.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 166523692 + ... + 166527572.

Almost surely, 2^646285977792 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 646285977792, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1182594653856).

646285977792 is an abundant number, since it is smaller than the sum of its proper divisors (1718903329920).

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

646285977792 is a wasteful number, since it uses less digits than its factorization.

646285977792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4278 (or 4259 counting only the distinct ones).

The product of its digits is 640120320, while the sum is 72.

The spelling of 646285977792 in words is "six hundred forty-six billion, two hundred eighty-five million, nine hundred seventy-seven thousand, seven hundred ninety-two".