646197211073 has 4 divisors (see below), whose sum is σ = 646702448640. Its totient is φ = 645691973508.

The previous prime is 646197211027. The next prime is 646197211081. The reversal of 646197211073 is 370112791646.

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-646197211073 is a prime.

It is a super-2 number, since 2×646197211073² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (646197211273) 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, 252616865 + ... + 252619422.

It is an arithmetic number, because the mean of its divisors is an integer number (161675612160).

Almost surely, 2^646197211073 is an apocalyptic number.

It is an amenable number.

646197211073 is a deficient number, since it is larger than the sum of its proper divisors (505237567).

646197211073 is a wasteful number, since it uses less digits than its factorization.

646197211073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505237566.

The product of its (nonzero) digits is 381024, while the sum is 47.

The spelling of 646197211073 in words is "six hundred forty-six billion, one hundred ninety-seven million, two hundred eleven thousand, seventy-three".