646198953 has 4 divisors (see below), whose sum is σ = 861598608. Its totient is φ = 430799300.

The previous prime is 646198939. The next prime is 646198963. The reversal of 646198953 is 359891646.

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 not a de Polignac number, because 646198953 - 2⁵ = 646198921 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 646198896 and 646198905.

It is not an unprimeable number, because it can be changed into a prime (646198963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107699823 + ... + 107699828.

It is an arithmetic number, because the mean of its divisors is an integer number (215399652).

Almost surely, 2^646198953 is an apocalyptic number.

It is an amenable number.

646198953 is a deficient number, since it is larger than the sum of its proper divisors (215399655).

646198953 is a wasteful number, since it uses less digits than its factorization.

646198953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215399654.

The product of its digits is 1399680, while the sum is 51.

The square root of 646198953 is about 25420.4436035251. The cubic root of 646198953 is about 864.5472824526.

The spelling of 646198953 in words is "six hundred forty-six million, one hundred ninety-eight thousand, nine hundred fifty-three".