646641363133026 has 80 divisors (see below), whose sum is σ = 1460673776855040. Its totient is φ = 213804646493760.

The previous prime is 646641363133013. The next prime is 646641363133039. The reversal of 646641363133026 is 620331363146646.

646641363133026 is a `hidden beast` number, since 6 + 4 + 6 + 6 + 4 + 13 + 6 + 313 + 302 + 6 = 666.

646641363133026 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (646641363133013) and next prime (646641363133039).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 93971331 + ... + 100617561.

It is an arithmetic number, because the mean of its divisors is an integer number (18258422210688).

Almost surely, 2^{646641363133026} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 646641363133026, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (730336888427520).

646641363133026 is an abundant number, since it is smaller than the sum of its proper divisors (814032413722014).

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

646641363133026 is a wasteful number, since it uses less digits than its factorization.

646641363133026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6651101 (or 6651092 counting only the distinct ones).

The product of its (nonzero) digits is 20155392, while the sum is 54.

The spelling of 646641363133026 in words is "six hundred forty-six trillion, six hundred forty-one billion, three hundred sixty-three million, one hundred thirty-three thousand, twenty-six".