664543412215 has 16 divisors (see below), whose sum is σ = 825131725056. Its totient is φ = 513263116800.

The previous prime is 664543412107. The next prime is 664543412227. The reversal of 664543412215 is 512214345466.

It is not a de Polignac number, because 664543412215 - 2⁷ = 664543412087 is a prime.

It is a super-2 number, since 2×664543412215² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5026642 + ... + 5157151.

It is an arithmetic number, because the mean of its divisors is an integer number (51570732816).

Almost surely, 2^664543412215 is an apocalyptic number.

664543412215 is a deficient number, since it is larger than the sum of its proper divisors (160588312841).

664543412215 is a wasteful number, since it uses less digits than its factorization.

664543412215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10184250.

The product of its digits is 691200, while the sum is 43.

The spelling of 664543412215 in words is "six hundred sixty-four billion, five hundred forty-three million, four hundred twelve thousand, two hundred fifteen".