646793112505 has 4 divisors (see below), whose sum is σ = 776151735012. Its totient is φ = 517434490000.

The previous prime is 646793112499. The next prime is 646793112541. The reversal of 646793112505 is 505211397646.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 498046364176 + 148746748329 = 705724^2 + 385677^2 .

It is a de Polignac number, because none of the positive numbers 2^k-646793112505 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64679311246 + ... + 64679311255.

It is an arithmetic number, because the mean of its divisors is an integer number (194037933753).

Almost surely, 2^646793112505 is an apocalyptic number.

It is an amenable number.

646793112505 is a deficient number, since it is larger than the sum of its proper divisors (129358622507).

646793112505 is a wasteful number, since it uses less digits than its factorization.

646793112505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129358622506.

The product of its (nonzero) digits is 1360800, while the sum is 49.

The spelling of 646793112505 in words is "six hundred forty-six billion, seven hundred ninety-three million, one hundred twelve thousand, five hundred five".