646027720594 has 4 divisors (see below), whose sum is σ = 969041580894. Its totient is φ = 323013860296.

The previous prime is 646027720589. The next prime is 646027720609. The reversal of 646027720594 is 495027720646.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 495027720646 = 2 ⋅247513860323.

It can be written as a sum of positive squares in only one way, i.e., 406040407369 + 239987313225 = 637213^2 + 489885^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161506930147 + ... + 161506930150.

Almost surely, 2^646027720594 is an apocalyptic number.

646027720594 is a deficient number, since it is larger than the sum of its proper divisors (323013860300).

646027720594 is a wasteful number, since it uses less digits than its factorization.

646027720594 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323013860299.

The product of its (nonzero) digits is 5080320, while the sum is 52.

Adding to 646027720594 its sum of digits (52), we get a palindrome (646027720646).

The spelling of 646027720594 in words is "six hundred forty-six billion, twenty-seven million, seven hundred twenty thousand, five hundred ninety-four".