651052166217 has 4 divisors (see below), whose sum is σ = 868069554960. Its totient is φ = 434034777476.

The previous prime is 651052166161. The next prime is 651052166243. The reversal of 651052166217 is 712661250156.

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 651052166217 - 2⁶ = 651052166153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (651052166117) 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, 108508694367 + ... + 108508694372.

It is an arithmetic number, because the mean of its divisors is an integer number (217017388740).

Almost surely, 2^651052166217 is an apocalyptic number.

It is an amenable number.

651052166217 is a deficient number, since it is larger than the sum of its proper divisors (217017388743).

651052166217 is a wasteful number, since it uses less digits than its factorization.

651052166217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217017388742.

The product of its (nonzero) digits is 151200, while the sum is 42.

It can be divided in two parts, 65105 and 2166217, that added together give a palindrome (2231322).

The spelling of 651052166217 in words is "six hundred fifty-one billion, fifty-two million, one hundred sixty-six thousand, two hundred seventeen".