646012455001 has 3 divisors (see below), whose sum is σ = 646013258751. Its totient is φ = 646011651252.

The previous prime is 646012454977. The next prime is 646012455031. The reversal of 646012455001 is 100554210646.

The square root of 646012455001 is 803749.

It is a perfect power (a square), and thus also a powerful number.

646012455001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 3546083401 + 642466371600 = 59549^2 + 801540^2 .

It is not a de Polignac number, because 646012455001 - 2⁷ = 646012454873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646012455031) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 401875 + ... + 1205623.

It is an arithmetic number, because the mean of its divisors is an integer number (215337752917).

Almost surely, 2^646012455001 is an apocalyptic number.

646012455001 is the 803749-th square number.

646012455001 is the 401875-th centered octagonal number.

It is an amenable number.

646012455001 is a deficient number, since it is larger than the sum of its proper divisors (803750).

646012455001 is an frugal number, since it uses more digits than its factorization.

646012455001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1607498 (or 803749 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 34.

Adding to 646012455001 its reverse (100554210646), we get a palindrome (746566665647).

The spelling of 646012455001 in words is "six hundred forty-six billion, twelve million, four hundred fifty-five thousand, one".