664415771306331 has 32 divisors (see below), whose sum is σ = 970493950976256. Its totient is φ = 400980700400000.

The previous prime is 664415771306327. The next prime is 664415771306341. The reversal of 664415771306331 is 133603177514466.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 664415771306331 - 2² = 664415771306327 is a prime.

It is a super-2 number, since 2×664415771306331² (a number of 30 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (664415771306341) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27298861 + ... + 45541841.

It is an arithmetic number, because the mean of its divisors is an integer number (30327935968008).

Almost surely, 2^{664415771306331} is an apocalyptic number.

664415771306331 is a deficient number, since it is larger than the sum of its proper divisors (306078179669925).

664415771306331 is a wasteful number, since it uses less digits than its factorization.

664415771306331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18247643.

The product of its (nonzero) digits is 22861440, while the sum is 57.

The spelling of 664415771306331 in words is "six hundred sixty-four trillion, four hundred fifteen billion, seven hundred seventy-one million, three hundred six thousand, three hundred thirty-one".