646546653401 has 4 divisors (see below), whose sum is σ = 705323621904. Its totient is φ = 587769684900.

The previous prime is 646546653373. The next prime is 646546653407. The reversal of 646546653401 is 104356645646.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-646546653401 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 646546653401.

It is not an unprimeable number, because it can be changed into a prime (646546653407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29388484235 + ... + 29388484256.

It is an arithmetic number, because the mean of its divisors is an integer number (176330905476).

Almost surely, 2^646546653401 is an apocalyptic number.

It is an amenable number.

646546653401 is a deficient number, since it is larger than the sum of its proper divisors (58776968503).

646546653401 is a wasteful number, since it uses less digits than its factorization.

646546653401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58776968502.

The product of its (nonzero) digits is 6220800, while the sum is 50.

The spelling of 646546653401 in words is "six hundred forty-six billion, five hundred forty-six million, six hundred fifty-three thousand, four hundred one".