646702309051 has 4 divisors (see below), whose sum is σ = 646788762504. Its totient is φ = 646615855600.

The previous prime is 646702309003. The next prime is 646702309073. The reversal of 646702309051 is 150903207646.

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

It is a cyclic number.

It is not a de Polignac number, because 646702309051 - 2¹¹ = 646702307003 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 646702308989 and 646702309007.

It is not an unprimeable number, because it can be changed into a prime (646702309651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43215505 + ... + 43230466.

It is an arithmetic number, because the mean of its divisors is an integer number (161697190626).

Almost surely, 2^646702309051 is an apocalyptic number.

646702309051 is a deficient number, since it is larger than the sum of its proper divisors (86453453).

646702309051 is an equidigital number, since it uses as much as digits as its factorization.

646702309051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86453452.

The product of its (nonzero) digits is 272160, while the sum is 43.

The spelling of 646702309051 in words is "six hundred forty-six billion, seven hundred two million, three hundred nine thousand, fifty-one".