646111819674 has 72 divisors (see below), whose sum is σ = 1478159946900. Its totient is φ = 203939513856.

The previous prime is 646111819649. The next prime is 646111819679. The reversal of 646111819674 is 476918111646.

It is a happy number.

646111819674 is a `hidden beast` number, since 6 + 4 + 611 + 1 + 8 + 19 + 6 + 7 + 4 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 566019989649 + 80091830025 = 752343^2 + 283005^2 .

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 646111819674.

It is not an unprimeable number, because it can be changed into a prime (646111819679) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 14513802 + ... + 14558250.

Almost surely, 2^646111819674 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 646111819674, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (739079973450).

646111819674 is an abundant number, since it is smaller than the sum of its proper divisors (832048127226).

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

646111819674 is a wasteful number, since it uses less digits than its factorization.

646111819674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46732 (or 46710 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 54.

The spelling of 646111819674 in words is "six hundred forty-six billion, one hundred eleven million, eight hundred nineteen thousand, six hundred seventy-four".