646320697 has 4 divisors (see below), whose sum is σ = 705077136. Its totient is φ = 587564260.

The previous prime is 646320629. The next prime is 646320707. The reversal of 646320697 is 796023646.

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-646320697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646320197) 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, 29378203 + ... + 29378224.

It is an arithmetic number, because the mean of its divisors is an integer number (176269284).

Almost surely, 2^646320697 is an apocalyptic number.

It is an amenable number.

646320697 is a deficient number, since it is larger than the sum of its proper divisors (58756439).

646320697 is a wasteful number, since it uses less digits than its factorization.

646320697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58756438.

The product of its (nonzero) digits is 326592, while the sum is 43.

The square root of 646320697 is about 25422.8380988433. The cubic root of 646320697 is about 864.6015726649.

The spelling of 646320697 in words is "six hundred forty-six million, three hundred twenty thousand, six hundred ninety-seven".