664148193 has 4 divisors (see below), whose sum is σ = 885530928. Its totient is φ = 442765460.

The previous prime is 664148179. The next prime is 664148213. The reversal of 664148193 is 391841466.

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 664148193 - 2¹² = 664144097 is a prime.

It is not an unprimeable number, because it can be changed into a prime (664148393) 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, 110691363 + ... + 110691368.

It is an arithmetic number, because the mean of its divisors is an integer number (221382732).

Almost surely, 2^664148193 is an apocalyptic number.

It is an amenable number.

664148193 is a deficient number, since it is larger than the sum of its proper divisors (221382735).

664148193 is a wasteful number, since it uses less digits than its factorization.

664148193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221382734.

The product of its digits is 124416, while the sum is 42.

The square root of 664148193 is about 25771.0727948993. The cubic root of 664148193 is about 872.4790319069.

The spelling of 664148193 in words is "six hundred sixty-four million, one hundred forty-eight thousand, one hundred ninety-three".