664148471 has 8 divisors (see below), whose sum is σ = 759354240. Its totient is φ = 569024568.

The previous prime is 664148467. The next prime is 664148489. The reversal of 664148471 is 174841466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 664148471 - 2² = 664148467 is a prime.

It is a super-3 number, since 3×664148471³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664148071) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1961 + ... + 36498.

It is an arithmetic number, because the mean of its divisors is an integer number (94919280).

Almost surely, 2^664148471 is an apocalyptic number.

664148471 is a deficient number, since it is larger than the sum of its proper divisors (95205769).

664148471 is a wasteful number, since it uses less digits than its factorization.

664148471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40933.

The product of its digits is 129024, while the sum is 41.

The square root of 664148471 is about 25771.0781885431. The cubic root of 664148471 is about 872.4791536413.

The spelling of 664148471 in words is "six hundred sixty-four million, one hundred forty-eight thousand, four hundred seventy-one".